How to prove it
 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:

'Trivial'.
 Proof by vigorous handwaving:

Works well in a classroom or seminar setting.
 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 omission:

'The reader may easily supply the details'
'The other 253 cases are analogous'
'...'
 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 funding:

How could three different government agencies be wrong?
 Proof by eminent authority:

'I saw Karp in the elevator and he said it was probably NP
complete.'
 Proof by personal communication:

'Eightdimensional colored cycle stripping is NPcomplete
[Karp, personal communication].'
 Proof by reduction to the wrong problem:

'To see that infinitedimensional 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 picture:

A more convincing form of proof by example. Combines well
with proof by omission.
 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 forward reference:

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

Some of the standard but inconvenient definitions are changed
for the statement of the result.
 Proof by appeal to intuition:

Cloudshaped drawings frequently help here.