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15.07.2019 •
Mathematics
What is the definition of a relation
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Ответ:
in mathematics, an, n-ary relation on n sets, is any subset of cartesian product of the n sets.
Ответ:
{x\ x e U and x has a negative square root} is an empty set.
Step-by-step explanation:
If x e U, x is a negative real number, and they don't have a square root (they don't have even roots). Their square roots are complex numbers, not real ones.