Am 23.04.2012 12:19, schrieb Invisible:
> OK, so "magma" consists of a set S and a binary operator #. The #
> operator takes any two elements of S (including the possibility of two
> copies of the same element), and yields a new element of S (possibly the
> same one you started with).

And here I was thinking that magma consisted of molten minerals...

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