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:I agree; that section is at best confusing, and at worst wrong. I've added a "Confusing section" tag. [[User:PatricKiwi|PatricKiwi]] ([[User talk:PatricKiwi|talk]]) 06:54, 16 February 2021 (UTC)
::It needs a source, but the RHS is obviously just the Cartesian product of two isosceles right triangles 0≤x≤y≤N and 0≤z≤w≤N in the xy and zw planes, a natural geometric interpretation of a squared triangular number. —[[User:David Eppstein|David Eppstein]] ([[User talk:David Eppstein|talk]]) 07:01, 16 February 2021 (UTC)
:::Thank you for this explanation; it's a lot clearer than the paragraph in the article itself. Perhaps you'd like to improve that paragraph - or at least give it a tag that you feel is more appropriate than "Confusing"? [[User:PatricKiwi|PatricKiwi]] ([[User talk:PatricKiwi|talk]]) 07:28, 16 February 2021 (UTC)
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