Englishfor English speakers
involutory
adjective
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(math) Of a mapping or transformation: being its own inverse.
involutory
noun
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(math) A linear transformation that is its own inverse, i.e., that has period two.
algebra
Noun
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Algebra is a kind of mathematics where a letter (called a variable) can replace a number that is not known.
Using algebra, we can define a line with the formula mathy = x + 3/math