(c 1980?, to the tune of The Twelve Days of Christmas)
On the nth day of Yellow Pigs my true love gave to me ...
A strategy in a game tree
Simple groups
Sylow theorems
Fearless functors
Golden rings
Permutations
Integrations
Applications
Contradictions
Random digits
Lower limits
Days of Christmas
Prime divisors
Farey fractions
Holey donuts
Fields a-splitting
Se(heaven)teen!