MathFlux — free math reference

Lessons & formulas for
eight branches of mathematics

Step-by-step explanations, worked examples, and formula sheets. Algebra through differential equations. No account needed.

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𝑥

Algebra

Equations, inequalities, functions, and polynomials.

Geometry

Shapes, angles, transformations, and proofs.

Calculus

Limits, derivatives, integrals, and series.

θ

Trigonometry

Sine, cosine, tangent, and their applications.

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σ

Statistics

Data analysis, probability, and distributions.

Linear Algebra

Vectors, matrices, and transformations.

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Number Theory

Primes, divisibility, and modular arithmetic.

δ

Differential Equations

First-order, second-order, and Laplace transforms.

What you'll find here

01

Step-by-step explanations

Concepts are broken down with plain language so you understand the reasoning, not just the result.

02

Worked examples

Solved problems show how to apply each formula and technique in practice.

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03

Diagrams and graphs

Visual aids for abstract concepts — especially useful for geometry, calculus, and linear algebra.

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04

Practice problems

Exercises at different difficulty levels for each topic.

05

Formula reference sheets

Quick-lookup tables for common formulas, organized by subject.

06

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Everything on the site is free. No sign-ups, no paywalls.

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Sample content

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A glimpse at how lessons are structured on MathFlux.

Algebra

The Quadratic Formula

For ax² + bx + c = 0:

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x = (-b ± √(b² - 4ac)) / (2a)

The value b² − 4ac (the discriminant) determines the nature of the roots:

  • > 0 — two distinct real roots
  • = 0 — one repeated real root
  • < 0 — two complex conjugate roots
Continue reading →
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Calculus

Fundamental Theorem of Calculus

This theorem links differentiation and integration:

∫ₐᵇ f(x) dx = F(b) − F(a)

Where F is any antiderivative of f, i.e. F′(x) = f(x). Consequences:

  • Integration and differentiation are inverse operations
  • Definite integrals reduce to antiderivative evaluation
  • Net signed area = difference of antiderivative values
Continue reading →
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