Yoneda's lemma asserts that every natural transformation between Hom functors is of this form. In other words, the Hom functors give rise to a full...

Fix Drywall Holes by Walter Curtis Inside This Article 1.  Fixing a Small Drywall Hole 2.  Fixing a Large Drywall Hole 3.  See all Drywall and Plas...

Cauchy in 1845 and Frobenius in 1887 also knew of this formula. In fact, the lemma was apparently so well known that Burnside simply omitted to att...