Post #1209914
2026-03-16 19:26 UTC
@alexdbolton They specifically mean it should have *only* rotational symmetry of order 2, and no other symmetry. There are many flags that have rotational symmetry of order 2, but most of them have reflection symmetry as well.
Replies (1)
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@alexdbolton@mathstodon.xyz 2026-03-16 19:54
@robinhouston Doesn't the Japanese one have reflective symmetry too?