A rough draft.

A rough draft.

(Source: stoicmike, via ghost-pup)

Class shitsketches

metacarpolis:

BOON FROM THE SKY

BOON FROM THE SKY

metacarpolis:

BOON FROM THE SKY

BOON FROM THE SKY

metacarpolis:

BOON FROM THE SKY
THIS OTHER PLANT PARASITIZES FUNGI
LOOK AT THIS COOL PARASITIC PLANT

How to prove it

paratactician:

curiosamathematica:

  • 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:
    "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 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:
    Cloud-shaped drawings frequently help here.

(Source: Dana Angluin, Sigact News 1983)

#not irrelevant to the humanities

(via velarapproximant)

gabunomnom:

saltyvessels:

thathickstergirl:

magicalbeautifulkibi:

ive-been-tired:

kuneria:

Bob Ross used to be a drill sergeant but quit because he hated having to shout at people. 

That at is why he always talked in such a calm voice.

Bob Ross is probably my favorite human being on television

He’s one of my favorite people

(via plants-please)

metacarpolis:

And then Metacarpolis sank into the swamp.

Day reblog.