reciprocals, multiplicative inverses
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two numbers with a product of 1 are called elements
The product of -1 and -1 is 1. The reciprocal of a fraction is called its reciprocal.
Two numbers are negative reciprocals if their product is -1. The numbers 1/2 and -2 are negative reciprocals. Their product is -1. This is often seen in problems involving the slopes of two lines. The slopes of perpendicular lines are negative reciprocals. Their product is -1.
Any two numbers whose product is '1' are each others' reciprocals.
1*1 = 1