Good point! I've been wondering if M should necessarily be homeomorphic to a ball, too. Like, a swiss cheese sandwich ought to be a sandwich, no? But then you'd have paths from B to B' that pass through the holes in M.https://twitter.com/Crashing00/status/936034547548000256 …
I've been arguing that a sandwich should be strictly defined, and more generalized sandwich-like foods satisfy the locally sandwich criterion
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I'm wondering whether bread may have holes, or if holes are considered an aspect of Swiss cheese?
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.