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A comment on An update on the campaign to defend serious math education in California. Parent comment

Re:An update on the campaign to defend serious math educatio... by snvzz on Tuesday April 26, 2022 @05:06PM (#31173179)
I know about QED, but I am not familiar with the concept of "QED box".

A cursory web search yielded nothing.

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Re:An update on the campaign to defend serious math educatio... by ludwigschubert on Tuesday April 26, 2022 @05:21PM (#31173354)
It’s a symbol that goes by many names: the tombstone, end-of-proof, or Q.E.D.

"∎"

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Re:An update on the campaign to defend serious math educatio... by snvzz on Tuesday April 26, 2022 @10:20PM (#31175543)
Interesting.

I wasn't familiar with this, despite being a graduate. Its use might depend wildly on where.

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