Grabel’s Law: 2 is not equal to 3. Not even for very large values of 2.
The Fundamental Theorem of Analysis: Any theorem of analysis can be proven on an arbitrarily small piece of paper provided the author is sufficiently vague.
The Golden Rule of Teaching Mathematics: You must tell the truth, and nothing but the truth, but not the whole truth.
The Golden Rule of Deriving: Never trust any result that was proved after 11 pm.
The law of conservation of difficulties: There is no easy way to prove a deep result.