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if formula_3 is an identity element of formula_4 (i.e., "s" is a unital magma) and formula_5, then formula_6 is called a left inverse of formula_7 and formula_7 is called a right inverse of formula_6.
אם formula_3 הוא איבר היחידה של formula_4 ומתקיים formula_5, אז formula_6 הוא הופכי משמאל של formula_7, ו-formula_7 הוא הופכי מימין של formula_6.