> 1. I have no strong opinion on ++ vs. concat, except that "concat" seems > more self-explanatory. "concat" occurs 373 times in set.mm, so ++ would > save 1492 bytes in set.mm size. > > I'll also mention that Tarski used a frown symbol for concatenation in his 1965 paper. His notation is reproduced on p. 190 of the Metamath book, using the LaTeX symbol "\frown".
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