Whoever did this has never drawn a swastika before. The one on the right is backwards, and the left one is ????https://twitter.com/NYDailyNews/status/799766392383930368 …
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IIRC, You only need [fa, fl] = 0 (proved) and False nonsingular (which I assumed was obvious)
As a word problem [fa, fl] = 0 is not proven, we don't even know inverses exist.
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