I found another interesting one.
Thank you very much for the clear and pleasing presentation.
If you collect a larger set of proofs without words, it would be very useful for all students (and teachers) of the non-English speaking countries like Iran.
Comment by massoud raji — October 15, 2009 @ 10:25 am
I examined and I found the proofs quite successful. Visual proofs are very useful…
Comment by esra — December 2, 2011 @ 10:53 pm
Very useful, thanks.
Comment by alex — March 24, 2013 @ 11:33 pm
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