@BoydStephenSmithJr@hachyderm.io
Post #3134029
2026-04-27 05:32 UTC
@gregeganSF@mathstodon.xyz Is "number of crossings" well-defined? I thought humanity has recently shown that the crossing number isn't preserved by all topological operations.
Replies (1)
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@gregeganSF@mathstodon.xyz 2026-04-27 05:34
@BoydStephenSmithJr@hachyderm.io https://en.wikipedia.org/wiki/Crossing_number_(knot_theory)