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solution
diagonal symmetry seems to be all the rage these days, but this isn't exactly hopping on the bandwagon: this puzzle, in its earliest incarnations, dates all the way back to 2012 (!), though i didn't get involved with this puzzle until early 2016. either way, this one's been a long time coming. it's possible that, if the chronicle of higher education was still doing crosswords, this one might have seen the light of day before now; it was accepted there but unfortunately didn't make it into print before the chronicle ceased publishing crosswords.
unrelatedly, this puzzle's second co-author (noam elkies) is much more known for his work in mathematics and has an erdos number of two, via john horton conway; if this crossword counts (and i don't see why it shouldn't, although it'd be slightly more legit if this was actually published somewhere), then i have an erdos number of three.
also, i'll be streaming some crosswords and rows garden puzzles tonight on twitch; it'll be a fun time, and if you can get kevin bacon to join me, so much the better.
