Re: [math-fun] Proofs without words

Can someone please point me to proofs without words for c) sum of the first n cubes = (sum of first n numbers)^2

I love this one. I'll try to ascii-fy it: A BB CCC DDDD B EE FFF GGGG B EE FFF GGGG C FF HHH IIII C FF HHH IIII C FF HHH IIII D GG III JJJJ D GG III JJJJ D GG III JJJJ D GG III JJJJ A BB EE BB EE CCC FFF HHH FFF FFF HHH FFF CCC HHH DDDD GGGG IIII JJJJ IIII GGGG IIII JJJJ IIII GGGG IIII JJJJ IIII GGGG DDDD JJJJ I think JHC & RKG's _Book of Numbers_ has a nice 3-d picture of this, but my copy isn't to hand to check. --Michael Kleber -- It is very dark and after 2000. If you continue you are likely to be eaten by a bleen.