The human race is a race of cowards; and I am not only marching in that
procession but carrying a banner.
-- Mark Twain
HOW TO PROVE IT, PART 1
proof by example:
The author gives only the case n = 2 and suggests that it
contains most of the ideas of the general proof.
proof by intimidation:
proof by vigorous handwaving:
Works well in a classroom or seminar setting.