**Proof by vigorous handwaving:**Works well in a classroom or seminar setting.

**Proof by forward reference:**Reference is usually to a forthcoming paper of the author, which is often not as forthcoming as at first.

**Proof by funding:**How could three different government agencies be wrong?

**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 omission:**"The reader may easily supply the details" or "The other 253 cases are analogous"

**Proof by deferral:**"We'll prove this later in the course".

**Proof by picture:**A more convincing form of proof by example. Combines well with proof by omission.

**Proof by intimidation:**"Trivial."

**Proof by adverb:**"As is quite clear, the elementary aforementioned statement is obviously valid."

**Proof by seduction:**"Convince yourself that this is true! "

**Proof by cumbersome notation:**Best done with access to at least four alphabets and special symbols.

**Proof by exhaustion:**An issue or two of a journal devoted to your proof is useful.

**Proof by obfuscation:**A long plotless sequence of true and/or meaningless syntactically related statements.

**Proof by wishful citation:**The author cites the negation, converse, or generalization of a theorem from the literature to support his claims.

**Proof by eminent authority:**"I saw Karp in the elevator and he said it was probably NP- complete."

**Proof by personal communication:**"Eight-dimensional colored cycle stripping is NP-complete [Karp, personal communication]."

**Proof by reduction to the wrong problem:**"To see that infinite-dimensional colored cycle stripping is decidable, we reduce it to the halting problem."

**Proof by reference to inaccessible literature:**The author cites a simple corollary of a theorem to be found in a privately circulated memoir of the Slovenian Philological Society, 1883.

**Proof by importance:**A large body of useful consequences all follow from the proposition in question.

**Proof by accumulated evidence:**Long and diligent search has not revealed a counterexample.

**Proof by cosmology:**The negation of the proposition is unimaginable or meaningless. Popular for proofs of the existence of God.

**Proof by mutual reference:**In reference A, Theorem 5 is said to follow from Theorem 3 in reference B, which is shown to follow from Corollary 6.2 in reference C, which is an easy consequence of Theorem 5 in reference A.

**Proof by metaproof:**A method is given to construct the desired proof. The correctness of the method is proved by any of these techniques.

**Proof by vehement assertion:**It is useful to have some kind of authority relation to the audience.

**Proof by ghost reference:**Nothing even remotely resembling the cited theorem appears in the reference given.

**Proof by semantic shift:**Some of the standard but inconvenient definitions are changed for the statement of the result.

**Proof by appeal to intuition:**Cloud-shaped drawings frequently help here.