Mathematics, 23.02.2021 22:20, Tirone

Real numbers are (closed/not closed) under multiplication. Irrational numbers are (closed/not closed) under division.

Integers are (closed/not closed) under subtraction.

Positive rational numbers are (closed/not closed) under addition.

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Real numbers are (closed/not closed) under multiplication. Irrational numbers are (closed/not close...