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Specific functions

Absolute value
Distance from zero to a number
Bessel function
Families of solutions to related differential equations
Binary logarithm
Mathematical function
Common logarithm
Mathematical function
Complex logarithm
Logarithm of a complex number
Constant function
Type of mathematical function
Cube root
Number whose cube is a given number
Cubic function
Polynomial function of degree 3
Dirac delta function
Generalized function whose value is zero everywhere except at zero
Elementary function
Mathematical function
Error function
Sigmoid shape special function
Euler's totient function
Gives the number of integers relatively prime to its input
Exponential function
Class of specific mathematical functions
Exponential growth
Growth of quantities at rate proportional to the current amount
Exponential integral
Special function defined by an integral
Exponentiation
Mathematical operation
Factorial
Product of all integers from 1 to a given integer
Floor and ceiling functions
Mathematical functions rounding a number to the two closest integers
Gamma function
Extension of the factorial function
Gaussian function
Mathematical function
Heaviside step function
Indicator function of positive numbers
Hyperbolic functions
Mathematical functions for hyperbolas similar to trigonometric functions for circles
Identity function
In mathematics, a function that always returns the same value that was used as its argument
Inverse hyperbolic functions
Mathematical functions
Inverse trigonometric functions
Inverse functions of sin, cos, tan, etc.
Knuth's up-arrow notation
Method of notation of very large integers
Kronecker delta
Mathematical function of two variables; outputs 1 if they are equal, 0 otherwise
Lambert W function
Multivalued function in mathematics
Linear function (calculus)
Polynomial function of degree at most one
Logarithm
Mathematical function, inverse of an exponential function
Möbius function
Multiplicative function in number theory
Natural logarithm
Logarithm to the base of the mathematical constant e
Negation
Operation that takes a proposition p to another proposition "not p", written ¬p, which is interpreted intuitively as being true when p is false, and false when p is true; unary (single-argument) logical connective
nth root
Arithmetic operation
Prime-counting function
Function representing the number of primes less than or equal to a given number
Quadratic function
Polynomial function of degree two
Rational function
Ratio of polynomial functions
Rectangular function
Function whose graph is 0, then 1, then 0 again, in an almost-everywhere continuous way
Riemann zeta function
Analytic function in mathematics
Sign function
Mathematical function that extracts the sign of a real number or complex number
Sine and cosine
Trigonometric functions of an angle
Square (algebra)
Result of multiplying a number, or other expression, by itself
Square root
Number whose square is a given number
Step function
Linear combination of indicator functions of real intervals
Stirling's approximation
Approximation for factorials
Trigonometric functions
Functions of an angle
Weierstrass function
Function that is continuous everywhere but differentiable nowhere