First angle in a triangle

Geometry

Second angle in a triangle

Geometry

Euler-Mascheroni constant

Number theory

Derivative

Calculus

Small positive quantity

Calculus

Riemann (___) function

Complex analysis, number theory

Efficiency

Statistics

Plane angle

Geometry

Imaginary unit (square root of -1)

General

Condition number of a matrix

Numerical analysis

A general eigenvalue

Linear algebra

Möbius function

Number theory

Degree of freedom

Statistics

A random variable

Statistics

Big/small o notation

Numerical analysis

Ratio of a circumference to its diameter

Geometry

Radius in a polar coordinate system

Geometry

Summation operator

General

Ratio of a circumference to its radius

Geometry

Golden ratio

General

Chromatic number of a graph

Graph theory

Reciprocal Fibonacci constant

Number theory

The first infinite ordinal

Set theory

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