..

[Virga]

Man trūkst foruma pavediena, kurā rakstīt jokus par fiziku. Tad nu lūk, te viņš ir. Aizsākumam šis satriecošais pasniedzēju ceļvedis. Esmu izmantojusi vismaz 70% no šīm pierādīšanas metodēm savās stundās.



How to prove it. Guide for lecturers.


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.

[joo]

Labs, paldies.

Vai tu plāno stundās izmantot visus veidus ? Kurus tu izmanto visbiežāk ?

Landau is famous for waving off proofs in the "and it should be obvious to the reader that equation 111 follows from 110 and 109", where "it should be obvious" is an eight page proof.

[Virga]

Mani 3 biežākie ir "pārējie 10^6 gadījumi ir analogi šim", "mēs šo pierādīsim nākamajā stundā" un "tas taču ir triviāli"

[joo]

(02.01.2015 02:00 )Virga rakstīja:  Mani 3 biežākie ir "pārējie 10^6 gadījumi ir analogi šim", "mēs šo pierādīsim nākamajā stundā" un "tas taču ir triviāli"

"..šo mēs pierādījām iepriekšējā stundā."

[FrankJScott]

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