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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeJan 26th 2021
• (edited Jan 26th 2021)

The first line of the Idea-section read:

Every magma $A$ has an opposite $A^op$ in which the operation goes the other direction.

This rather sounded like talking about co-magmas. I have replaced this now with the following more lengthy but less ambiguous sentence:

The opposite of a magma – hence of a set with a binary operation $(x,y) \mapsto x y$ – has the same underlying set of elements, but binary operation changed by reversing the order of the factors: $(x,y) \mapsto y x$.

Also I touched the Definition-section, trying to beautify a little, both the wording and the formulas.