Ciro Santilli @cirosantilli 37

Basically a synonym of trope, but without the negative connotation.

Ultimate explanation: math.stackexchange.com/questions/776039/intuition-behind-normal-subgroups/3732426#3732426

Does not have to be isomorphic to a subgroup:This is one of the reasons why the analogy between simple groups of finite groups and prime numbers is limited.

Ciro Santilli considered this as the basis for Ciro's 2D reinforcement learning games, but ultimately decided it was a bit too messy. Nice overall though.

Open source development model in which developers develop in private, and only release code to the public during releases.

Notable example project: Android Open Source Project.

This development model basically makes reporting bugs and sending patches a waste of time, because many of them will already have been solved, which is why this development model is evil.

Well known popular science character. He just looks futuristic and wraps stuff in exciting empty words. When he shows up, you won't be learning much.

One of the Millennium Prize Problems.

See also: existence and uniqueness of solutions of partial differential equations.

Some blogs:

Also resonates with backward design.