Triangular numbers #1044
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Triangular numbers #1044
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Thanks! Merging when CI is happy. |
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Proves the usual formula for triangular numbers in this form:
Depends on #1042 #1043 (both merged now)
I just proved this, because I wondered how if it is as little work as I thought it is.
Judging from this PR, it looks pleasant, but I actually had to do some refactoring to make it so.