quandle

Meaning

Noun

• A rack, $\backslash scriptstyle\; \backslash mathrm\{Q\}\backslash ,$, such that $\backslash scriptstyle\; \backslash forall\; a\; \backslash ;\backslash in\backslash ;\; \backslash mathrm\{Q\}$ $a\backslash triangleright\; a\; =\; a$ or equivalently $a\; \backslash triangleleft\; a\; =\; a$.

Origin

• Coined by David Joyce in his 1982 paper A classifying invariant of knots: the knot quandle.