Question for finitists -- 0.999... = 1?

[polymath257]

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It was valid in discrete math class when I was in University.

You were taught naive set theory, as was I.  Little to no introduction to ZFC.

ZFC vs naive ST isn't so much the issue here as clarity about what an infinite decimal expansion means. Which means being a bit more precise about what it means to be a real number (although, in this case, we are doing convergence in the rationals).