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math.HO2024
Comparing angles in Euclid's Elements
Alexander Shen
The exposition in Euclid's Elements contains an obvious gap (seemingly unnoticed by most commentators): he often compares not just angles, but *groups* of angles, and at the same t…
math.HO2023
Israil Moiseevich Gelfand [In Russian]
Alexander Shen
I was lucky to meet (and even cooperate at some extent) with Israel M. Gelfand, and tried to write down (mainly in 2003-2013) my recollections about his work style and lessons I le…