William Elliot wrote: > > If into a field with five cows, you add > a bull, how much bull will you get?
The word problem for groups is (recursively) unsolvable. I've never heard of a word problem for fields. I do recall a school physics teacher asking "What do you find in magnetic fields?" I do not know what answer he was expecting, but the answer he got was "Magnetic cows." Oh, how we laughed.
-- When a true genius appears in the world, you may know him by this sign, that the dunces are all in confederacy against him. Jonathan Swift: Thoughts on Various Subjects, Moral and Diverting