This is a pun on "new math" (aka SMSG), developed within the cold war context to prod more Americans into a space age frame of mind. The Russians had launched Sputnik and paranoia was running high.
GNU = GNU's Not Unix, Richard Stallman's coin for a Unix-like command line environment, coded from scratch. Gnu Math integrates mathematics with a command line aesthetic, providing future Morlocks with tools of the trade.
For example, Pythonic Mathematics integrates algebra with OOP (the object oriented paradigm), a basis for many of our world game's models and simulations. The USG first got behind Python with its DARPA funding of Guido's CP4E initiative.
The civilian public education system was slow to catch on however, given the ideological priorities of a parasitical political machinery, which used the spectre of terrorism to keep Americans in a state of fear.
The Internet, also originally military, helped Americans develop antibodies to this parasitical ideology.
Thanks to the Internet, Gnu Math continued to make inroads, assisting the engineering community in its efforts to debug and restore integrity to a corrupted USA system.