The real benchmark for all intelligence is the “ability to comprehend general truths”.
Full stop. ;)
Abstract mathematics is the lowest, if anything.
Abstract:
late 14c., originally in grammar (in reference to nouns that do not name concrete things), from Latin abstractus "drawn away," past participle of abstrahere "to drag away, detach, pull away, divert," also used figuratively; from assimilated form of ab "off, away from" (see ab-) trahere "to draw" (from PIE root *tragh- "to draw, drag, move;" see tract(n.1)).
Technically speaking, “abstract mathematics” is an oxymoron. ;)
Happy hunting!