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Are there topological obstructions to the existence of almost quaternionic structures on com...

$\DeclareMathOperator\End{End}\newcommand\Id{\mathrm{Id}}\DeclareMathOperator\Sp{Sp}\DeclareMathOperator\SO{SO}$I start with some background, but people familiar with the subject may jump directly to …
Andrei Moroianu's user avatar