In this article, you’ll find a comprehensive list of math words that start with the letter “F.

- Factor – A number that divides another number exactly.
- Factorial – The product of all positive integers up to a given number.
- Fibonacci – A sequence where each number is the sum of the two preceding ones.
- Fraction – A part of a whole; a/the quotient of two numbers.
- Function – A relation between a set of inputs and a set of permissible outputs.
- Formula – A mathematical relationship expressed in symbols.
- Frequency – The number of occurrences of a repeating event per unit of time.
- Frustum – A portion of a solid (normally a cone or pyramid) that lies between two parallel planes.
- Foci – Plural of focus; points used to define conic sections.
**Face – The flat surface of a three-**dimensional shape.- Fibonacci Series – Another term for Fibonacci sequence.
- Forthcoming – Relatively forecasted or anticipated.
- Farey Sequence – A sequence of fractions in simplest form between 0 and 1.
**F-**test – A statistical test to determine if variances of two populations are equal.- Field – A set in which addition, subtraction, multiplication, and division are defined and behave as the corresponding operations on rational and real numbers.
- Function Table – A table used to organize input and output values.
**Fundamental Theorem of Algebra – Every non-**constant polynomial equation has at least one complex root.- FOIL Method – A technique for distributing two binomials.
- Finite – Having a limited number of elements.
- Fractional – Related to fractions.
- Fixed Point – A point that is mapped to itself by a function.
- First Quartile – The median of the lower half of a data set.
- Finite Set – A set with a finite number of elements.
- Five Number Summary – Consists of the minimum, first quartile, median, third quartile, and maximum.
- Floor Function – The function that takes a real number and gives the greatest integer less than or equal to that number.
- Flux – The rate of flow of a property per unit area.
- Fourier Series – A way to represent a function as the sum of simple sine waves.
- Fixed Cost – A cost that does not change with the level of production or sales.
- Fundamental Theorem of Calculus – Links the concept of the derivative of a function with the concept of the integral.
- Fourier Transform – A mathematical transform that decomposes functions depending on space or time into functions depending on spatial or temporal frequency.
- Free Energy – Used to determine the spontaneity of a process.
- Final Value – The value approached by the function as the input increases without bound.
- Factorization – The process of breaking down an entity into a product of other entities.
- Fundamental Matrix – A square matrix solution to a system of linear differential equations.
- Feasible Region – The set of all possible points that satisfy a system of inequalities.
- Figure – A geometric form.
**Fractal – A complex geometric pattern exhibiting self-**similarity.- Fraction Bar – The line that separates the numerator and denominator in a fraction.
- First Derivative – Represents the slope or rate of change of a function.
- Fundamental Group – A concept in algebraic topology that captures information about the basic shape, or holes, of a topological space.
- Fubini’s Theorem – Provides conditions under which a double integral can be computed as an iterated integral.
- Floating Point – A way to represent real numbers in computing that can support a wide range of values.
- Folded Normal Distribution – A probability distribution related to the normal distribution.
- Finite Difference – An expression of the form f(x + b) – f(x + a).
- Fractional Exponent – An exponent expressed as a fraction.
- Fold – To bring two parts or sides together.
- Fluctuation – A variation in a set of data points.
- Fuzzy Logic – A form of logic used when information is imprecise.
- Fixed Variable – A constant value in a mathematical function or equation.
**Foster Series – A series in electrical network theory representing two-**port networks.**F-**distribution – The probability distribution of the ratio of two independent chi-squared variables divided by their respective degrees of freedom.- Friction – The resistance that one surface or object encounters when moving over another.
- Frame – A coordinate system.
- Flux Integral – An integral that calculates the flow of a vector field through a surface.
- Fourier Coefficient – Coefficients of the terms of the Fourier series of a function.
**Five-**point Discrete Laplace Operator – Used in the numerical solution of partial differential equations.- Finite Element – A small piece of a larger geometric object used in finite element analysis.
- Focus – A point used to construct and define a conic section.
- Fuzzy Set – A set without a sharp boundary; defined by membership function.
- Full Rank – When the matrix has no linearly dependent rows or columns.
- Fibonacci Heap – A data structure for priority queue operations.
**Filament – A slender thread-**like object or fiber.- Frobenius Endomorphism – A special kind of mapping associated with fields that have prime characteristic.
- Fitted Value – The estimated value in a regression.
- Focal Point – The center of interest or activity.
- Fermat’s Little Theorem – States that if p is a prime number, then for any integer a, the number a^p – a is an integer multiple of p.
- Field Extension – An enlarged field containing another field.
- Finite Automaton – A theoretical machine used in computer science.
- Fundamental Mode – The mode with the lowest frequency.
- Fermat’s Last Theorem – States that no three positive integers a, b, and c satisfy a^n + b^n = c^n for any integer value of n greater than 2.
- Free Variable – A variable in a mathematical function not constrained by conditions.
**Fibonacci Polynomial – A sequence of polynomials defined by a Fibonacci-**like recurrence.- Feigenbaum Constant – A mathematical constant that is the limiting ratio of each bifurcation interval to the next.
- Forcing Term – A term added to a differential equation representing an external influence.
**Fixed-**Point Iteration – A method of computing fixed points of iterated functions.**Fractional Part – The non-**integer part of a number.- Fourier Analysis – The study of how general functions can be represented by sums of simpler trigonometric functions.
- Fundamental Solution – A solution of a differential equation that represents the response to a delta function source term.
- Fundamental Polygon – A simple polygon used in the study of surface tilings and topology.
- Flip – To turn over or rotate.
- Frobenius Number – The largest monetary amount that cannot be obtained using any combination of specified denominations.
- Farey Neighbor – Two fractions that are neighbors in a Farey sequence.
- Fixed Step Size – A uniform interval in numerical methods.
- Fourier Basis – An orthonormal basis of functions used in Fourier series representation.
- Fault – An incorrect step, process, or data definition.
**Fixed-**point Arithmetic – Arithmetic using fixed precision for the numbers.- Fredholm Alternative – A result concerning the solvability of certain integral equations.
- Free Energy Change – The change in free energy of a system as it undergoes a process.
- Focus Directrix – A line surrounding a focus point.
**Fractional KPZ Equation – A fractional extension of the Kardar-**Parisi-Zhang equation.- Fermat’s Principle – A principle stating that the path taken between two points by a ray of light is the path that can be traversed in the least time.
- Field Line – A line that represents both the direction and the strength of a force field.
- Fourier Multiple – Multiple terms in a Fourier series.
- Focal Length – The distance from the center of a lens to the focal point.
- Functional Equation – An equation that specifies a function in implicit form.
- Finite Geometry – A geometry having only a finite number of points.
- Frobenius Norm – A measure of matrix size based on the sum of the absolute squares of its elements.
- Fixed Angle – An angle that does not change.
- Fractional Linear Transformation – A function of the form (ax + b) / (cx + d).
- Fourier Integral – Representing a function as an integral of trigonometric functions.

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