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Forum: Discrete Math

Discrete Math Help Forum: Discrete mathematics, logic, set theory

  1. Sticky Thread   Difference equation tutorial: draft of part I

    chisigma
    difference, draft, equation, tutorial
    • Replies: 3
    • Views: 915
    chisigma
    September 21st 2011, 07:45 AM Go to last post

  2. Exclamation Sticky Thread   Please read before posting logic questions.

    mr fantastic
    logic, posting, questions, read
    • Replies: 0
    • Views: 1,332
    mr fantastic
    February 11th 2011, 11:34 AM Go to last post

  3. Sticky Thread   List of rules used to moderate MHF - please read carefully.

    mr fantastic
    carefully, list, mhf, moderate, read, rules
    • Replies: 0
    • Views: 1,139
    mr fantastic
    July 19th 2010, 10:33 PM Go to last post
  4.   Discussions  

  1. Number of permutations without a cycle of length k

    boony
    cycle, length, number, permutations
    • Replies: 1
    • Views: 110
    Annatala
    November 24th 2011, 04:41 PM Go to last post

  2. Very basic induction (sum of first n positive integers) - help needed

    mathpv0
    basic, induction, integers, needed, positive, sum
    • Replies: 3
    • Views: 169
    mathpv0
    November 24th 2011, 04:05 PM Go to last post

  3. Need Help With a Derivation Involving Universal Quantifiers

    mirko
    derivation, involving, quantifiers, universal
    • Replies: 10
    • Views: 657
    emakarov
    November 24th 2011, 04:03 AM Go to last post

  4. Difference Equation

    kanezila
    difference, equation
    • Replies: 1
    • Views: 112
    FernandoRevilla
    November 23rd 2011, 08:24 PM Go to last post

  5. Help with functions.

    Lowoctave
    functions
    • Replies: 5
    • Views: 111
    Lowoctave
    November 23rd 2011, 08:54 AM Go to last post

  6. Exclamation Permutations and Combinations

    Ilsa
    combinations, permutations
    • Replies: 1
    • Views: 143
    Plato
    November 23rd 2011, 08:31 AM Go to last post

  7. formula sets. proof: if Γ subset Σ => Γ = Σ

    suslik
    Γ, Σ, >, formula, proof, sets, subset
    • Replies: 7
    • Views: 304
    MoeBlee
    November 23rd 2011, 07:47 AM Go to last post

  8. How would I represent this proposition symbollically?

    kmjt
    proposition, represent, symbollically
    • Replies: 1
    • Views: 82
    MoeBlee
    November 22nd 2011, 01:34 PM Go to last post

  9. A triangle B?

    kmjt
    triangle
    • Replies: 2
    • Views: 844
    kmjt
    November 22nd 2011, 12:53 PM Go to last post

  10. Inclusion–exclusion principle

    Garas
    inclusion–exclusion, principle
    • Replies: 1
    • Views: 140
    Soroban
    November 22nd 2011, 05:45 AM Go to last post

  11. Using First DeMorgan's Law to Derive the Second

    GGB1387
    demorgan, derive, law
    • Replies: 3
    • Views: 1,268
    emakarov
    November 22nd 2011, 01:29 AM Go to last post

  12. Spanning Subgraph

    jzellt
    spanning, subgraph
    • Replies: 3
    • Views: 1,113
    Swlabr
    November 22nd 2011, 12:54 AM Go to last post

  13. Prove if f(x)={2-x if x≤1: 1/x if x>1} is one to one but not onto R

    Aquameatwad
    1 or x, fx2x, prove, x&#, x&gt1
    • Replies: 4
    • Views: 212
    Aquameatwad
    November 21st 2011, 06:06 PM Go to last post

  14. How many ways to order a bag of various marbles

    takatok
    bag, marbles, order, ways
    • Replies: 4
    • Views: 136
    takatok
    November 21st 2011, 04:07 PM Go to last post

  15. Prove if f:A-->B and g:B-->C are functions and gof:A-->C is one to one, then f:A-->B

    Aquameatwad
    fa&gtb, functions, gb>c, gofa>c, prove
    • Replies: 5
    • Views: 883
    Plato
    November 21st 2011, 04:05 PM Go to last post

  16. Number of different pairings of 2n objects.

    Mathsdog
    number, objects, pairings
    • Replies: 3
    • Views: 482
    takatok
    November 21st 2011, 10:33 AM Go to last post

  17. proof by week induction

    Jskid
    induction, proof, week
    • Replies: 1
    • Views: 155
    emakarov
    November 20th 2011, 03:19 PM Go to last post

  18. For which natural numbers n do there exist nonnegative integers x and y such that...

    Brjakewa
    exist, integers, natural, nonnegative, numbers
    • Replies: 1
    • Views: 404
    emakarov
    November 20th 2011, 09:13 AM Go to last post

  19. Translating to set notation with existence.

    cynlix
    existence, notation, set, translating
    • Replies: 2
    • Views: 118
    superkiller
    November 20th 2011, 08:44 AM Go to last post

  20. Chromatic Polynomial: Does anyone else get the same answer as me?

    terrorsquid
    answer, chromatic, polynomial
    • Replies: 1
    • Views: 166
    PaulRS
    November 20th 2011, 05:54 AM Go to last post

  21. Let n be a natural number. Make a conjecture about the nth derivative of the function

    Brjakewa
    conjecture, derivative, function, make, natural, nth, number
    • Replies: 5
    • Views: 434
    Deveno
    November 19th 2011, 09:10 PM Go to last post

  22. Show this is a tautology using a calculation

    Lepzed
    calculation, tautology
    • Replies: 1
    • Views: 151
    emakarov
    November 19th 2011, 05:55 AM Go to last post

  23. [SOLVED] Big-Oh notation and a logarithmic function problem

    x3bnm
    • Replies: 3
    • Views: 292
    x3bnm
    November 18th 2011, 12:19 PM Go to last post

  24. Quick question about the empty set and the power set

    Robinator
    power, question, quick, set
    • Replies: 4
    • Views: 140
    MoeBlee
    November 18th 2011, 07:40 AM Go to last post

  25. Red face Help on proving equal cardinalities

    gordo151091
    cardinalities, equal, proving 1 Attachment(s)
    • Replies: 3
    • Views: 132
    Opalg
    November 18th 2011, 07:22 AM Go to last post

  26. No. of distinct 4 letter words from mathematics.

    prasum
    distinct, letter, mathematics, words
    • Replies: 1
    • Views: 406
    Soroban
    November 18th 2011, 07:01 AM Go to last post

  27. Fol 14

    logics
    fol
    • Replies: 10
    • Views: 181
    emakarov
    November 18th 2011, 03:29 AM Go to last post

  28. difficulty following proof by induction

    Jskid
    difficulty, induction, proof
    • Replies: 3
    • Views: 96
    Prove It
    November 17th 2011, 08:25 PM Go to last post

  29. Expand in terms of binomials coefficients

    ehpoc
    binomials, coefficients, expand, terms
    • Replies: 4
    • Views: 135
    ehpoc
    November 17th 2011, 07:48 PM Go to last post

  30. Pigeon hole principle

    ehpoc
    hole, pigeon, principle
    • Replies: 7
    • Views: 372
    ehpoc
    November 17th 2011, 07:44 PM Go to last post

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