Single-variable calculus
353 problems · Functions of one real variable.
Ex.1A functional equation with f(2x)
Functional equations
L1
Ex.2A recurrence and a proof by induction
Sequences
High school
Ex.3Cauchy's equation f(x + y) = f(x) + f(y)
Functional equations
L1
Ex.4Continuity with parameters
Continuous and discontinuous functions
High school
Ex.5When do integrals of powers converge?
Improper integrals
L1
Ex.6Extending a rational function by continuity
Continuous and discontinuous functions
High school
Ex.7An integral whose integrand blows up
Improper integrals
L1
Ex.8Polynomial bounds for sine and cosine
Differentiable functions
L1
Ex.9Terms that do not tend to zero
Convergence tests
L1
Ex.10Expanding √x at x = 4
Taylor expansions
L1
Ex.15A fence along a river
Optimisation and curve sketching
High school
Ex.16f(x)f(y) − f(xy) = x + y
Functional equations
L1
Ex.17The mean value theorem
Mean Value Theorem
High school
Ex.18Rolle's theorem on a polynomial
Mean Value Theorem
High school
Ex.19Step functions and their integrals
Riemann integral
High school
Ex.20Integral of a constant step function
Riemann integral
High school
Ex.21An improper integral with exponentials
Improper integrals
L1
Ex.22Three basic limits by conjugation and standard limits
Limits
High school
Ex.24Equivalents, and a sign trap
Convergence tests
L1
Ex.25A fixed point for every continuous self-map of [0,1]
Intermediate Value Theorem
High school
Ex.26Extensions by continuity and oscillation
Continuous and discontinuous functions
L1
Ex.27Locating the roots of a cubic
Intermediate Value Theorem
High school
Ex.28How long is the drug effective?
Intermediate Value Theorem
High school
Ex.29An improper integral of a rational function
Improper integrals
M1
Ex.30Where is 1/ln|x| continuous?
Continuous and discontinuous functions
L1
Ex.31Which of these functions extend by continuity?
Continuous and discontinuous functions
L1
Ex.32lim (1/x² − 1/sin² x)
Taylor expansions
L1
Ex.33lim ((1 + x)^(1/x) / e)^(1/x)
Taylor expansions
L2
Ex.42lim cos(1/n)^(n²)
Taylor expansions
L1
Ex.43Mean value theorem for $f(x)=x^3$
Mean Value Theorem
High school
Ex.44Summary of the mean value theorem
Mean Value Theorem
High school
Ex.45Additivity over adjacent intervals
Riemann integral
High school
Ex.46A step function built from the floor
Riemann integral
High school
Ex.47Linearity of the integral on step functions
Riemann integral
High school
Ex.48Monotonicity of the integral
Riemann integral
High school
Ex.49Summary of step functions and Riemann integration
Riemann integral
High school
Ex.50Two subdivisions for the same function
Riemann integral
High school
Ex.51Four limits with absolute value and trigonometry
Limits
High school
Ex.52Three more classical limits
Limits
L1
Ex.53Proving convergence by comparison
Improper integrals
L1
Ex.54Floor plus square root of the fractional part
Continuous and discontinuous functions
L1
Ex.55The monk on the mountain
Intermediate Value Theorem
High school
Ex.56Expansions of 1/(1 + x + x²) and ln(1 + x + x²)
Taylor expansions
L1
Ex.62Position of a curve relative to its tangent
Taylor expansions
L1
Ex.63Integral of $|f|$ for a step function
Riemann integral
High school
Ex.64Darboux sums for a step function
Riemann integral
L1
Ex.65A step function with zero integral
Riemann integral
High school
Ex.66Squeezing between step functions
Riemann integral
L1
Ex.67A convergent improper integral of $\ln x/(1+x)^2$
Improper integrals
L1
Ex.68An improper integral of $\ln x/x^2$ by parts
Improper integrals
L1
Ex.69Three limits involving logarithm and exponentials
Limits
L1
Ex.70The midpoint functional equation
Functional equations
L1
Ex.75Composition with a continuous function
Riemann integral
L1
Ex.76A monotone function on a fine grid
Riemann integral
L1
Ex.78Glued along the rationals and the irrationals
Continuous and discontinuous functions
L1
Ex.79The limit of an iterated sequence is a fixed point
Continuous and discontinuous functions
L1
Ex.80Maximum and minimum of two continuous functions
Continuous and discontinuous functions
L1
Ex.81The absolute value of a continuous function
Continuous and discontinuous functions
L1
Ex.82The ε–N definition of a limit
Sequences
L1
Ex.83How many terms are needed to compute sin 1?
Taylor expansions
L1
Ex.86How many trees in the orchard?
Optimisation and curve sketching
High school
Ex.87Fixed point on [0,1]
Intermediate Value Theorem
High school
Ex.88A continuous periodic function is bounded
Continuous and discontinuous functions
L1
Ex.93Additive and multiplicative functions
Functional equations
L1
Ex.94Cauchy's equation with monotonicity
Functional equations
Olympiad
Ex.96A parameter integral equal to arctan
Riemann integral
L1
Ex.97A limit via the mean value theorem for integrals
Riemann integral
L1
Ex.100f(x + y) + f(x − y) = 2f(x)f(y)
Functional equations
Olympiad
Ex.101f(x² + f(y)) = y + f(x)²
Functional equations
Olympiad
Ex.102When the equivalence rule for improper integrals fails
Improper integrals
L1
Ex.103Limit of an integral with arctan
Riemann integral
L1
Ex.104Limit of an integral with cosine and logarithm
Riemann integral
L1
Ex.105Commuting maps on $[0,1]$ share a fixed point
Intermediate Value Theorem
L1
Ex.106Lipschitz functions are uniformly continuous
Continuous and discontinuous functions
L1
Ex.109Distance to a line, without a formula
Optimisation and curve sketching
High school
Ex.110Continuous functions with f^2=1 on an interval
Intermediate Value Theorem
High school
Ex.1111/x on (0,1] is not uniformly continuous
Continuous and discontinuous functions
L1
Ex.112The square root: uniformly continuous, not Lipschitz
Continuous and discontinuous functions
L1
Ex.113x² is not uniformly continuous on the real line
Continuous and discontinuous functions
L1
Ex.114A continuous f with f o f= cos cannot exist
Functional equations
L1
Ex.116Least squares for a line through the origin
Optimisation and curve sketching
L1
Ex.117Limits of sums as Riemann sums
Riemann integral
L1
Ex.119A limit of a product via Riemann sums
Riemann integral
L1
Ex.121The most economical speed of a truck
Optimisation and curve sketching
High school
Ex.123The economic order quantity
Optimisation and curve sketching
L1
Ex.125Maximising profit
Optimisation and curve sketching
L1
Ex.127The strongest beam cut from a log
Optimisation and curve sketching
L1
Ex.129A window with a semicircular top
Optimisation and curve sketching
L1
Ex.132The trapezoid of largest area with three equal sides
Optimisation and curve sketching
L1
Ex.135The triangle of least area through a point
Optimisation and curve sketching
L1
Ex.137Among triangles with a given base and perimeter, the isosceles one is the largest
Optimisation and curve sketching
L2
Ex.139The largest rectangle inscribed in an ellipse
Optimisation and curve sketching
L1
Ex.141The largest cone and the largest cylinder inscribed in a sphere
Optimisation and curve sketching
L1
Ex.142The paper cup of largest capacity
Optimisation and curve sketching
L1
Ex.144At which height should a lamp be hung?
Optimisation and curve sketching
L2
Ex.147Maximum sustainable yield
Optimisation and curve sketching
L2
Ex.149The shortest path touching a line
Optimisation and curve sketching
L1
Ex.152The closest point of an ellipse
Optimisation and curve sketching
L1
Ex.154Minimising a/x + b/(1 − x)
Optimisation and curve sketching
L2
Ex.156The best constant approximating x²
Optimisation and curve sketching
L2
Ex.158Firing up a slope: the best angle
Optimisation and curve sketching
L2
Ex.159The maximum of 3 sin x + 4 cos x
Optimisation and curve sketching
L1
Ex.161Global extrema of x³ − 3x on [−2, 3]
Optimisation and curve sketching
High school
Ex.163Extrema of |x² − 3x + 2| on [0, 3]
Optimisation and curve sketching
High school
Ex.167The maximum of xⁿe^(−x)
Optimisation and curve sketching
L1
Ex.168The minimum of x^x
Optimisation and curve sketching
L1
Ex.171A family of functions: x² + m/x
Optimisation and curve sketching
L1
Ex.172Complete study of x e^(−x)
Optimisation and curve sketching
L1
Ex.175Complete study of (ln x)/x
Optimisation and curve sketching
L1
Ex.176Sketching x³/(x² − 1)
Optimisation and curve sketching
L2
Ex.177Sketching x√(1 − x²)
Optimisation and curve sketching
L2
Ex.178How many solutions does eˣ = ax have?
Optimisation and curve sketching
L1
Ex.184The exponential lies above its tangent
Differentiation
L1
Ex.187Integral of sine squared
Integration techniques
L1
Ex.188Integration by parts
Integration techniques
L1
Ex.192(e^(2x) − 1) over x
Limits
L1
Ex.193A limit by factoring
Limits
High school
Ex.194Limits of rational functions at infinity
Limits
High school
Ex.195One-sided limits of |x|/x
Limits
High school
Ex.196sin(3x) over 5x
Limits
High school
Ex.197Sine over x at infinity
Limits
High school
Ex.198A telescoping sum
Sequences
High school
Ex.199Area between a parabola and a line
Riemann integral
High school
Ex.200An area with an absolute value
Riemann integral
High school
Ex.201Arithmetic and geometric sequences
Sequences
High school
Ex.202Recognising antiderivatives
Riemann integral
High school
Ex.203Derivative of a quotient
Differentiable functions
High school
Ex.207Geometric Series
Series
High school
Ex.208Geometric series and repeating decimals
Find the sum
High school
Ex.209Geometric series with a parameter
Find the sum
High school
Ex.210Integrals that simplify by parity
Riemann integral
High school
Ex.211Rolle's theorem on a quartic
Mean Value Theorem
L1
Ex.212The sum of the first n squares
Sequences
High school
Ex.213Derivative and tangent line of a cubic
Differentiable functions
High school
Ex.214The derivative from the definition
Differentiable functions
High school
Ex.314A limit with sine
Limits
L2
Ex.316A cubic with exactly one real root
Intermediate Value Theorem
L1
Ex.318A limit with the exponential
Limits
L2
Ex.321An improper integral
Improper integrals
L2
Ex.332Radius of convergence
Power series
L2
Ex.343The logarithm lies below its tangent
Differentiation
L1
Ex.344The conjugate trick at infinity
Limits
L1
Ex.345The conjugate trick at zero
Limits
High school
Ex.346Epsilon-delta for a linear function
Limits
L1
Ex.347(e^x − cos x) over sin x
Limits
L1
Ex.348One minus cosine over x squared
Limits
L1
Ex.349Sine is 1-Lipschitz
Mean Value Theorem
L1
Ex.350The n-th root of n
Sequences
L1
Ex.351(2^x − 1) over x
Limits
L1
Ex.352x ln(1 + 1/x) at infinity
Limits
L1
Ex.353x times sin(1/x)
Limits
L1
Ex.354A continuous function that vanishes on the rationals
Continuous and discontinuous functions
L1
Ex.355A linear recurrence of order two
Sequences
L1
Ex.356A telescoping product
Sequences
L1
Ex.357A telescoping sum with factorials
Sequences
L1
Ex.358A square root whose difference tends to 1/2
Convergence tests
M1
Ex.359An arithmetico-geometric sequence
Sequences
L1
Ex.360Odd degree polynomials have a real root
Intermediate Value Theorem
L1
Ex.361The Bertrand series, all cases
Convergence tests
L1
Ex.362Derivative of an inverse function
Differentiable functions
L1
Ex.363A surprisingly simple derivative
Differentiable functions
L1
Ex.364Derivative with an absolute value
Differentiable functions
L1
Ex.365Differentiability when gluing two pieces
Differentiable functions
L1
Ex.372Splitting the sum of 1/n² into even and odd terms
Find the sum
L1
Ex.374Integration by parts, two classics
Integration techniques
L1
Ex.375Three limits by the squeeze theorem
Sequences
L1
Ex.376Logarithmic differentiation
Differentiable functions
L1
Ex.377The mean value theorem and an arctangent inequality
Mean Value Theorem
L2
Ex.378Two-sided bounds for the logarithm
Mean Value Theorem
L1
Ex.381Simplifying and decomposing rational integrands
Integration techniques
L1
Ex.385Series with factorials and the number e
Find the sum
L1
Ex.386Integration by substitution
Integration techniques
L1
Ex.387Tangent lines through an external point
Differentiable functions
High school
Ex.388Telescoping series with partial fractions
Find the sum
L1
Ex.389Telescoping with logarithms
Find the sum
L1
Ex.390Telescoping with a shift p
Find the sum
L1
Ex.391Telescoping with square roots
Convergence tests
L1
Ex.392The bisection method in practice
Intermediate Value Theorem
L1
Ex.393The comparison test in practice
Convergence tests
L1
Ex.394The derivative of an integral with variable bounds
Riemann integral
L1
Ex.395The largest rectangle in a semicircle
Optimisation and curve sketching
High school
Ex.396The most economical can
Optimisation and curve sketching
High school
Ex.397The ratio test
Convergence tests
L1
Ex.398Three ways to fail to be differentiable
Differentiable functions
L1
Ex.399Trigonometric integrals by linearisation
Integration techniques
L1
Ex.579The binomial expansion of √(1 + x)
Taylor expansions
L1
Ex.580The Taylor expansion of arctan by integrating
Taylor expansions
L1
Ex.616A function with zero derivative is constant
Mean Value Theorem
L1
Ex.617Sign of the derivative and monotonicity
Mean Value Theorem
L1
Ex.639Cauchy's equation on the rationals
Functional equations
M1
Ex.662Equivalence between $\sum u_n$ and $\sum\ln(1+u_n)$
Convergence tests
L1
Ex.698A recursive sequence converging to 2
Sequences
L1
Ex.700Convergence of the series of 1/n²
Convergence tests
L1
Ex.702Divergence of the harmonic series
Convergence tests
L1
Ex.707Cosine to the power 1/x²
Limits
L2
Ex.708Difference of two infinite reciprocals
Limits
L2
Ex.709Epsilon-delta for x squared
Limits
L1
Ex.710The gap between two exponentials at infinity
Limits
L1
Ex.711The logarithm is slower than any power
Limits
L1
Ex.712(1 + sin x)^(1/x)
Limits
L1
Ex.713Polynomials versus the exponential
Limits
L1
Ex.714sin x − x cos x over x cubed
Limits
L2
Ex.715sin(1/x) has no limit at 0
Limits
L1
Ex.716Tangent minus sine over x cubed
Limits
L1
Ex.717x ln x at zero, and x^x
Limits
L1
Ex.718x sin x has no limit at infinity
Limits
L1
Ex.719x times the Dirichlet function
Limits
L1
Ex.720A continuous function with rational values is constant
Intermediate Value Theorem
L1
Ex.721Fixed point and a derivative bounded by one
Mean Value Theorem
L2
Ex.722A recurrent sequence and its fixed point
Sequences
L2
Ex.723A reduction formula
Integration techniques
L1
Ex.724Cancellation revealed by a Taylor expansion
Convergence tests
L1
Ex.725A telescoping sum that proves ζ(2) converges
Convergence tests
L1
Ex.726Absolute, conditional or no convergence
Convergence tests
L1
Ex.727Solving an integral equation
Riemann integral
L1
Ex.728Completing the square before integrating
Integration techniques
L1
Ex.729An integral singular at both endpoints
Improper integrals
L1
Ex.730Binet's formula for the Fibonacci numbers
Sequences
L1
Ex.731Classifying a critical point when f″(0) = 0
Taylor expansions
L1
Ex.732Comparing the harmonic sum with the logarithm
Riemann integral
L1
Ex.735Convergence to the golden ratio
Sequences
L1
Ex.736cos x = 1/x has infinitely many solutions
Intermediate Value Theorem
L1
Ex.737Counting solutions depending on a parameter
Intermediate Value Theorem
L1
Ex.738Integrating by parts twice and coming back
Integration techniques
L1
Ex.739Darboux sums of the Dirichlet function
Riemann integral
L1
Ex.755Which is larger, e^π or π^e?
Optimisation and curve sketching
L1
Ex.756tan x = x on each branch
Intermediate Value Theorem
L1
Ex.760Functions whose derivative is proportional to themselves
Differentiable functions
L1
Ex.761Heron's method for √2
Sequences
L1
Ex.762If f′ tends to ℓ, then f(x+1) − f(x) tends to ℓ
Mean Value Theorem
L1
Ex.763Integrating ln and arctan by parts
Integration techniques
L1
Ex.764L'Hôpital's rule, twice
Differentiable functions
L1
Ex.772Power series of ln(1+x) and arctan x
Power series
L2
Ex.773Radius of convergence, four examples
Power series
L2
Ex.774The sine of an alternating term
Convergence tests
L1
Ex.775Solving y″ = −y with a power series
Power series
L2
Ex.776Summing power series in closed form
Power series
L2
Ex.777Supremum, infimum, limsup and liminf
Sequences
L1
Ex.778Approximating e with a guaranteed error
Taylor expansions
L1
Ex.779Alternating series and the error bound
Convergence tests
L1
Ex.780The area of an ellipse
Integration techniques
L1
Ex.781The Cauchy–Schwarz inequality for integrals
Riemann integral
L1
Ex.782The closest point on a parabola
Optimisation and curve sketching
L1
Ex.783Differentiating under the integral sign
Improper integrals
M1
Ex.784The hierarchy of growth
Sequences
L1
Ex.785The integral test and Bertrand series
Convergence tests
L1
Ex.786Using the substitution x → a + b − x
Integration techniques
L1
Ex.787The limit comparison test
Convergence tests
L1
Ex.788The limit of the derivative theorem
Mean Value Theorem
L2
Ex.789The n-th derivative of 1/(x² − 1)
Differentiable functions
L1
Ex.790The n-th derivative of x² e^x
Differentiable functions
L1
Ex.791The root test
Convergence tests
L1
Ex.792Three cases of order-two recurrences
Sequences
L1
Ex.793Two alternating series with logarithms
Convergence tests
L1
Ex.795When L'Hôpital's rule gives no answer
Differentiable functions
L1
Ex.796An equivalent of e^(sin x) − e^(tan x)
Taylor expansions
L2
Ex.797A one-sided bound for √(1 + x) from the Lagrange remainder
Taylor expansions
L1
Ex.798Computing ∫₀¹ sin(x²) dx with a series
Taylor expansions
L2
Ex.840A fast series for ln 2
Taylor expansions
L2
Ex.870cosh x ≤ e^(x²/2)
Taylor expansions
L2
Ex.956Finite difference formulas for f′
Taylor expansions
L3
Ex.985Derivatives of high order at 0 without differentiating
Taylor expansions
L2
Ex.1047Approximating x by a combination of sines
Taylor expansions
L2
Ex.1175Convergence of three series via expansions
Taylor expansions
L2
Ex.1181Expanding x/(eˣ − 1)
Taylor expansions
L2
Ex.1182Taylor series of the solution of y′ = x + y²
Taylor expansions
L2
Ex.1183The symmetric second difference
Taylor expansions
L2
Ex.1258f(x + f(y)) = f(x) + y on the rationals
Functional equations
Olympiad
Ex.1268An arctangent inequality
Mean Value Theorem
L1
Ex.1269An exponential inequality
Mean Value Theorem
L1
Ex.1270A logarithm inequality via the MVT
Mean Value Theorem
L1
Ex.1271Bounding $f(b)-f(a)$
Mean Value Theorem
L1
Ex.1272Small-increment estimate
Mean Value Theorem
L1
Ex.1273Bounded derivative implies Lipschitz
Mean Value Theorem
L1
Ex.1274Rolle and the sign of $f'$
Mean Value Theorem
L1
Ex.1275Rolle on a polynomial with three roots
Mean Value Theorem
L1
Ex.1276Uniqueness of a root
Mean Value Theorem
L1
Ex.1314f(x)f(y) − f(xy) = x + y
Functional equations
M1
Ex.1393Three logarithmic series
Find the sum
L1
Ex.1394Six numeric series: convergence study
Convergence tests
L1
Ex.1395Three convergent series with explicit sums
Find the sum
L1
Ex.1396Three series with computed sums
Find the sum
L1
Ex.1444Continuity of a piecewise function with an essential singularity
Continuity
L1
Ex.1464How fast does (1 + x)^(1/x) reach e?
Limits
L2
Ex.1465Where power means lead
Limits
L2
Ex.1466Reciprocal squares of x and tangent
Limits
L2
Ex.1467The Dirichlet function has no limit anywhere
Limits
L1
Ex.1468A recurrence with a double fixed point
Sequences
L1
Ex.1469A functional equation solved with derivatives
Differentiable functions
Olympiad
Ex.1470The series of 1/(ln n)^(ln n)
Convergence tests
L1
Ex.1471Adjacent sequences and the irrationality of e
Sequences
L1
Ex.1472Bounds for n! by comparing with an integral
Riemann integral
L1
Ex.1473Cauchy's condensation test
Convergence tests
M1
Ex.1474A Cauchy product that diverges
Convergence tests
L1
Ex.1479Continuous injective functions are monotone
Intermediate Value Theorem
L2
Ex.1480A convex function and its asymptote
Differentiable functions
L1
Ex.1481Convexity forces the derivative to be continuous
Differentiable functions
L1
Ex.1490The generating function of Fibonacci numbers
Power series
L2
Ex.1491How many solutions does ln x = ax have?
Intermediate Value Theorem
L1
Ex.1492Integrability with one wild point
Riemann integral
L1
Ex.1493Limits of integrals depending on n
Riemann integral
L1
Ex.1499A series of functions
Power series
L2
Ex.1502The sequence sin(n) does not converge
Sequences
L1
Ex.1503Speed of convergence
Sequences
L3
Ex.1504The alternating harmonic sums converge
Sequences
L2
Ex.1505The arithmetic–geometric mean
Sequences
L1
Ex.1506The generating function of central binomial coefficients
Power series
L2
Ex.1507The Cauchy criterion
Sequences
L1
Ex.1508A ratio test that fails, and how to conclude
Convergence tests
L1
Ex.1509The Cesàro lemma
Sequences
L1
Ex.1510The Euler-Mascheroni constant as a series
Find the sum
L1
Ex.1511e^x e^y = e^(x+y) from power series
Power series
L2
Ex.1512The horizontal chord of length one half
Intermediate Value Theorem
L2
Ex.1513The longest ladder around a corner
Optimisation and curve sketching
L2
Ex.1514From the ratio to the n-th root
Sequences
L2
Ex.1515The ratio test with a parameter
Convergence tests
L1
Ex.1516Monotonicity of (1 + 1/n)^n
Sequences
L1
Ex.1517The tangent half-angle substitution
Integration techniques
L1
Ex.1521Wallis integrals
Integration techniques
L1
Ex.1522Differentiable but not continuously differentiable
Differentiable functions
L1
Ex.1523An expansion of order 2 without a second derivative
Taylor expansions
L3
Ex.1524A rational approximation of cosine
Taylor expansions
L2
Ex.1525Expanding the inverse of x + x³
Taylor expansions
L2
Ex.1557Bounding f′ by f and f″ (Landau's inequality)
Taylor expansions
M1
Ex.1566Central binomial coefficients from (1 − 4x)^(−1/2)
Taylor expansions
L2
Ex.1657e is irrational
Taylor expansions
L2
Ex.1883Asymptotic expansion of (1 + 1/n)ⁿ
Taylor expansions
L2
Ex.1943An inequality as a functional equation (IMO 1977)
Functional equations
Olympiad
Ex.1953Cauchy's extended mean value theorem
Mean Value Theorem
L1
Ex.1954Darboux's theorem on derivatives
Mean Value Theorem
M1
Ex.1955Second-order Taylor formula
Mean Value Theorem
L1
Ex.1956Iterated Rolle
Mean Value Theorem
L1
Ex.1979Additive functions with f(x²) = f(x)²
Functional equations
Olympiad
Ex.1980Solving f(f(n)) = n + 2 on the positive integers
Functional equations
Olympiad
Ex.1981f(f(x) + y) = 2x + f(f(y) − x)
Functional equations
Olympiad
Ex.1982IMO 1968: f(x + a) = ½ + √(f(x) − f(x)²)
Functional equations
Olympiad
Ex.1983IMO 2010: f(⌊x⌋y) = f(x)⌊f(y)⌋
Functional equations
Olympiad
Ex.2034Four series involving logarithms
Convergence tests
L1
Ex.2067Tangent of sine minus sine of tangent
Limits
L2
Ex.2068An absolute value integral with a parameter
Riemann integral
Olympiad
Ex.2069The root of x^n + x = 1
Sequences
L1
Ex.2072Convergence of the series of sin(n)/n
Convergence tests
M1
Ex.2073Interlacing an arithmetic and a geometric progression
Sequences
Olympiad
Ex.2074Rearranging a conditionally convergent series
Find the sum
L1
Ex.2075Legendre polynomials have all their roots in (-1, 1)
Mean Value Theorem
L2
Ex.2077The integral of sin x / x
Improper integrals
M1
Ex.2078An integral that equals its own mirror image
Integration techniques
Olympiad
Ex.2079The logistic sequence decays like 1/n
Sequences
L2
Ex.2080The popcorn function
Continuous and discontinuous functions
L2
Ex.2081Reciprocals of integers with no digit 9
Convergence tests
L1
Ex.2082A series with an equivalent that converges but does not
Convergence tests
M1
Ex.2083A smooth function that is not its Taylor series
Taylor expansions
M1
Ex.2238A strictly increasing f with f(f(n)) = 3n
Functional equations
Olympiad
No problem matches these filters.