This is a nice short easy proof and I have no recollection at all of doing any abstract algebra in 2015. http://math.stackexchange.com/a/1293691/31475?stw=2 …
I have no idea if I could have come up with that today. And have no idea how I came up with it a yearish ago. Thought I forgot this all.
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With 25k+ rep on Math.SE, I have hundreds of answers up there which slowly keep generating. Always weird to see what pops up when I revisit.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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