Related:

• 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 accumulated evidence: Long and diligent search has not revealed a counterexample.
  proof by cosmology: The negation of the proposition is unimaginable or meaningless....
• proof by picture: A more convincing form of proof by example.
  Combines well with proof by omission. proof by vehement assertio...
• 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...
• 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....
• I said "fool-proof, NOT stupid-proof
• 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....
• An example is not proof.
• Lack of proof <> proof of lack.