LOL
Hypothesis
(via A little more time
(via xkcd: Angular Momentum)
Mobile app
laughingsquidLOL that reminds me of “the mobile version of our website where you can’t zoom and doesn’t feature a ‘desktop version’ link”
Recursion
stephendiazDefinition
Recursion, see Recursion.
Hunter, David (2011). Essentials of Discrete Mathematics. Jones and Bartlett. pp. 494.