additive inverse
if a=-1 then |-1|= -a
set notation
x= { 2, 4, 6, 8 ...} open set
x= { 2 ,4, 6, 8 ...298}
The product of two numbers with the same sign is positive
The product of two number with different signs is negative
The reciprocal of a non zero number is 1 over the number. (ex. a= 1/a )
The next scribe post is Jonathon
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