*mathematics is not an opinion*. The expression is exclusively Italian and mathematicians don't agree with this opinion, since they have fun inventing a large number of different mathematics. For example, a curious mathematics is what today called

*lunar arithmetic*. In this kind of arithmetic, the sum between two digits gives the largest digit, while the product between two digits gives the smallest one. A particular consequence of the multiplication rule is the definition of prime numbers: in base 10 a

*lunar prime number*is a number divisible only by itself and by 9, because the neutral element of

*lunar multiplication*is 9.

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*Mathematics in Europe*

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