Post #677038
2026-03-16 08:51 UTC
The Wikipedia page ‘Union Jack’ includes an unexpected mathematical digression:
“It is one of two national flags with two-fold rotational symmetry, symmetry group C₂, the other being the flag of Trinidad and Tobago.”
Replies (2)
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@soaproot@sfba.social 2026-03-16 15:57
@robinhouston I trust you have also seen https://flags.xaviershay.com/construction.html from @xshay which - I'm hoping my summary is correct - is about constructing flags using compass and straightedge.
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@alexdbolton@mathstodon.xyz 2026-03-16 19:05
@robinhouston doesn't the Japanese flag also have this property?