A fictional castaway. / (attributive, by extension) Something isolated and independent.

(mathematics) The numeric value of the integral over the positive real numbers of the reciprocal of the gamma function, F=∫₀ ᪲1/(𝛤(x))dx=2.8077702420285....

plural of Robinson-Schensted correspondence

(mathematics) A bijective correspondence between permutations and pairs of standard Young tableaux of the same shape. It has applications in combinatorics and other areas.

The second largest of the Juan Fernández Islands.

Very quickly; quicker than one expects.

Ingenious (and often complex) but absurdly impractical or even useless.

A genre of adventure fiction where a hero is stranded alone on a desert island and has to survive with his own wits.

(mineralogy) A monoclinic-prismatic bluish lead gray mineral containing antimony, lead, and sulfur.

Elaborate and impractical.