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Equation

Algebra

A mathematical statement that two expressions are equal, joined by an equals sign. Solving an equation means finding which values of its unknowns make the statement true, and the equals sign itself was invented only in 1557, well after equations had been written and solved for centuries using prose and other notations. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts

Origin Year

1557 1

1557 marks Robert Recorde's invention of the equals sign in The Whetstone of Witte, the origin of the modern written form of an equation; equations as mathematical statements, solved in prose and other notations, are centuries older, as the description notes.

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Associated With

In Branch

Source Equation (Wikipedia)

Kind Of Object Of

Abel's Summation Formula

Antoine Equation

Avrami Equation

Barometric Formula

Bellard's Formula

Bochner's Formula

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Cauchy's Equation

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Continuity Equation

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Euler-Maclaurin Formula

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Rule of Succession

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Statement Form Of

Clapeyron's Theorem

Class Number Formula

Cohn's Irreducibility Criterion

Convolution Theorem

Craig Interpolation Theorem

Cramér's Theorem (Large Deviations)

Danskin's Theorem

De Gua's Theorem

De Moivre-Laplace Theorem

De Moivre's Formula

De Morgan's Laws

Descartes Circle Theorem

Descartes' Rule of Signs

Difference of Two Squares

Dirichlet's Unit Theorem

Divergence Theorem

Dobinski's Formula

Dominated Convergence Theorem

Dorfman-Steiner Theorem

Ehrenfest Theorem

Eilenberg-Zilber Theorem

Envelope Theorem

Equipartition Theorem

Euler's Criterion

Euler's Identity

Euler's Polyhedron Formula

Euler's Quadrilateral Theorem

Fermat's Last Theorem

Fermat's Little Theorem

Ferrero-Washington Theorem

Feynman-Kac Formula

Fisher-Neyman Factorization Theorem

Fisher's Fundamental Theorem of Natural Selection

Fluctuation-Dissipation Theorem

Freudenthal Suspension Theorem

Frobenius Reciprocity Theorem

Fubini's Theorem

Fundamental Theorem of Calculus

Gabbay's Separation Theorem

Garfield's Proof of the Pythagorean Theorem

Gauss-Bonnet Theorem

Geometric Mean Theorem

Girsanov's Theorem

Glaisher's Theorem

Gradient Theorem

Green's Theorem

Hardy-Ramanujan Theorem

Hellmann-Feynman Theorem

Herbrand's Theorem

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Sources

1. Equation (Wikipedia)

Wikimedia FoundationLead section

Quote, Lead section

The "=" symbol, which appears in every equation, was invented in 1557 by Robert Recorde, who considered that nothing could be more equal than parallel straight lines with the same length.

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