Skip navigation

Tired of strange British comedy videos and musical numbers which just get stranger and stranger? Wishing for some serious mathematics on this Web of ours? Well, consider your wishes fulfilled:

Be forewarned — Dr. Cheng goes fast, and she mislabels one arrow in the associativity square ([tex]T \mu[/tex] instead of [tex]\mu T[/tex]) before catching herself.

Via The n-Category Café.


  1. Cool.

    Is that a space ship landing and taking off outside?

  2. She mislabeled the associativity square arrow! I would NEVER do something as silly as that… because I haven’t got a clue what an “associativity square” is in the first place, and so tend to avoid drawing arrows anywhere near them.

drugs online cialis | | viagra by mail order