Frank, Nick, Here's a non-manifold [(x, y) | (x, y) <- C², y² - x² == x³]
It was great when Frank or I were not connecting the physics to the mathematics in Baez, Hywel was there to talk neutrinos and the flavors of quarks. I think it was his brother(-in-law?) that had come to Friam, wasn't he a *constructivist* mathematician? Jon
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