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Line 92: George Polya, in his book "Mathematical discovery", Volume 2, 1968, presents this solution saying it "rained from the sky", as obtained algebraically with a trick, like a rabbit drawn out from the hat. Returning to the introduction to this talk page, seems that this geometric derivation is a little more ''direct'' than the algebraic presented in the article. In the article "Summation" i entered the talk: "Sum of the first n cubes (geometrical proof)", please to see it. --[[User:Ancora Luciano\|Ancora Luciano]] ([[User talk:Ancora Luciano\|talk]]) 06:15, 22 May 2013 (UTC)

Talk:Square pyramidal number: Difference between revisions