The multiplicative inverse of r is a number r^{-1} such that r · r^{-1} = 1.^{[1]} The number 1 is used here because it is the multiplicative identity .
The negative exponent is used to indicate division. So r^{-1} = 1/r, which indicates that r^{-1} is the multiplicative inverse of r. The reciprocal of a number is the same as the multiplicative inverse of a number.
Examples of multiplicative inverses:
# | A | B | C | D |
E | F | G | H | I |
J | K | L | M | N |
O | P | Q | R | S |
T | U | V | W | X |
Y | Z |
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