Equals sign
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The equals sign or equal sign, also known as the equality sign, is the mathematical symbol =, which is used to indicate equality. In an equation, it is placed between two expressions that have the sam
Recorde's introduction of "="
Plus and minus signs
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The plus sign and the minus sign are mathematical symbols used to denote positive and negative functions, respectively. In addition, the symbol + represents the operation of addition, which results in
Equals sign
…Logical equality Plus and minus signs Cajori, Florian (1993). A History of Mathematical Notations. New York: Dover (reprint). ISBN 0-486-67766-4…
From Johannes Widmann's book on "handy and pretty arithmetic for all merchants"