"Abstract nonsense" is a nonderogatory term that is commonly used by mathematicians when skipping over parts of an argument that can be proven through a commonly used long and theoretical argument with which readers are expected to be familiar. The usual usage is something like, "...from which the result can be shown through abstract nonsense."
Abstract Nonsense
This entry contributed by Wiktor K. Macura
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Macura, Wiktor K. "Abstract Nonsense." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/AbstractNonsense.html