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Forum: Discrete Mathematics, Set Theory, and Logic

Discrete Math, Graph Theory, Combinatorics, Recurrence Relations (Difference Equations), Set Theory, General and Symbolic Logic

  1. Sticky Thread Sticky Threads

  2. Sticky Thread Difference equation tutorial: draft of part II

    Started by chisigma, April 15th, 2012 12:32
    • Replies: 2
    • Views: 3,026
    March 2nd, 2013, 05:47 Go to last post
  3. Sticky Thread Difference equation tutorial: draft of part I

    Started by chisigma, March 2nd, 2012 12:37
    • Replies: 3
    • Views: 3,239
    March 6th, 2012, 03:02 Go to last post
  4. Sticky Thread Please Read Before Posting Logic Questions

    Started by Ackbach, January 27th, 2012 23:00
    • Replies: 0
    • Views: 1,652
    January 27th, 2012, 23:00 Go to last post
  1. Normal Thread Normal Threads

  2. Properties - Multiplication

    Started by evinda, January 9th, 2015 20:18
    cdot, multiplication, omega, omega$, properties
    • Replies: 4
    • Views: 416
    January 13th, 2015, 07:33 Go to last post
  3. How can we show that h is surjective?

    Started by evinda, January 13th, 2015 06:44
    $$$$, finite, injective, rightarrow
    • Replies: 0
    • Views: 300
    January 13th, 2015, 06:44 Go to last post
  4. The intervals are equinumerous

    Started by evinda, January 10th, 2015 19:09
    2 Pages
    1 2
    equinumerous, intervals, mathbbr$, show
    • Replies: 10
    • Views: 661
    January 12th, 2015, 20:13 Go to last post
  5. Properties of natural numbers

    Started by evinda, January 9th, 2015 10:38
    2 Pages
    1 2
    natural, numbers, omega, omega$, properties
    • Replies: 16
    • Views: 771
    January 12th, 2015, 15:16 Go to last post
  6. Constitution of real numbers

    Started by evinda, January 10th, 2015 18:13
    numbers, omega$, rational, relation, set
    • Replies: 1
    • Views: 340
    January 12th, 2015, 07:58 Go to last post
  7. The subsets of finite sets are finite sets.

    Started by evinda, January 11th, 2015 09:04
    finite, function, set, sets, show
    • Replies: 0
    • Views: 373
    January 11th, 2015, 09:04 Go to last post
  8. Constitution of integers

    Started by evinda, January 9th, 2015 20:40
    3 Pages
    1 2 3
    $langle, integers, rangle
    • Replies: 28
    • Views: 1,176
    January 10th, 2015, 17:50 Go to last post
  9. Why does it have to be Y=ω ?

    Started by evinda, January 8th, 2015 17:46
    2 Pages
    1 2
    neq, omega, omega$, subset, varnothing$
    • Replies: 18
    • Views: 734
    January 9th, 2015, 15:12 Go to last post
  10. The order I_A

    Started by evinda, December 23rd, 2014 15:04
    $a$, element, greatest, minimal, order
    • Replies: 9
    • Views: 534
    January 8th, 2015, 17:10 Go to last post
  11. Do we have to check this case?

    Started by evinda, January 7th, 2015 18:03
    $n$, i.e, natural, number, successor
    • Replies: 8
    • Views: 489
    January 8th, 2015, 14:53 Go to last post
  12. Show that a is the least

    Started by evinda, December 23rd, 2014 14:51
    show, wave
    • Replies: 2
    • Views: 424
    January 8th, 2015, 06:03 Go to last post
  13. Propositions

    Started by evinda, December 17th, 2014 17:23
    holds, leftrightarrow, leq, numbers
    • Replies: 3
    • Views: 479
    January 7th, 2015, 19:13 Go to last post
  14. Isn't it a non-strict total order?

    Started by evinda, January 7th, 2015 16:10
    $omega$, defines, omega^2, order, symbolized
    • Replies: 6
    • Views: 418
    January 7th, 2015, 17:50 Go to last post
  15. The relation is trichotomous

    Started by evinda, December 10th, 2014 18:10
    2 Pages
    1 2
    $t_m=omega$, lor, omega, rightarrow, subset
    • Replies: 11
    • Views: 775
    January 7th, 2015, 17:37 Go to last post
  16. Natural numbers

    Started by evinda, January 1st, 2015 15:09
    4 Pages
    1 2 3 ... 4
    natural, numbers, rightarrow, subset, subsetneq
    • Replies: 30
    • Views: 1,557
    January 7th, 2015, 12:04 Go to last post
  17. Do we have to show that the relation is irreflexive?

    Started by evinda, January 4th, 2015 20:08
    $a$, $s$, langle, order, rangle
    • Replies: 1
    • Views: 408
    January 5th, 2015, 10:03 Go to last post
  18. We cannot define an order over all the sets

    Started by evinda, December 7th, 2014 11:45
    2 Pages
    1 2
    define, order, set, sets, subset
    • Replies: 10
    • Views: 675
    January 4th, 2015, 14:15 Go to last post
  19. Prove relations

    Started by evinda, January 1st, 2015 12:55
    $d0$, div, fraced, prove, rfloor$
    • Replies: 4
    • Views: 365
    January 3rd, 2015, 14:49 Go to last post
  20. How have we concluded that X is an inductive set?

    Started by evinda, December 6th, 2014 15:27
    concluded, inductive, rightarrow, set, subset
    • Replies: 3
    • Views: 341
    January 1st, 2015, 15:28 Go to last post
  21. Basic Set Theory - Notation

    Started by Rido12, January 1st, 2015 04:23
    $bbbr^3$, ambigious, dimension, i.e, x^2-1right$$
    • Replies: 2
    • Views: 315
    January 1st, 2015, 14:28 Go to last post
  22. There is a unique inductive set

    Started by evinda, December 5th, 2014 12:08
    2 Pages
    1 2
    • Replies: 11
    • Views: 702
    December 30th, 2014, 22:07 Go to last post
  23. Why is it ⋂ω={0} ?

    Started by evinda, December 6th, 2014 15:42
    2 Pages
    1 2
    $b=omega$, $bigcap, inductive, omega=, set
    • Replies: 13
    • Views: 744
    December 30th, 2014, 20:56 Go to last post
  24. Why does it suffice to show that X is an inductive set?

    Started by evinda, December 6th, 2014 11:45
    natural, numbers, omega, omega$, show
    • Replies: 1
    • Views: 355
    December 30th, 2014, 17:50 Go to last post
  25. Why doesn't the converse hold?

    Started by evinda, December 17th, 2014 18:39
    2 Pages
    1 2
    $$$$, $a$, $forall, converse, leq
    • Replies: 18
    • Views: 1,287
    December 24th, 2014, 17:14 Go to last post
    • Replies: 6
    • Views: 622
    December 16th, 2014, 23:09 Go to last post
  26. Why should we study logic?

    Started by Chris L T521, December 16th, 2014 12:10
    answer, logic, question
    • Replies: 1
    • Views: 541
    December 16th, 2014, 16:21 Go to last post
  27. Kind of edge

    Started by evinda, December 9th, 2014 17:56
    • Replies: 2
    • Views: 387
    December 14th, 2014, 20:51 Go to last post
  28. Strict total order

    Started by evinda, December 7th, 2014 17:47
    3 Pages
    1 2 3
    forall, order, relation, rightarrow, total
    • Replies: 22
    • Views: 1,375
    December 13th, 2014, 19:11 Go to last post
  29. Prove that A - (B U C) = (A - B) ∩ (A - C)

    Started by KOO, October 26th, 2013 00:20
    • Replies: 3
    • Views: 17,372
    December 9th, 2014, 15:11 Go to last post
  30. Cardinality

    Started by evinda, December 8th, 2014 14:54
    $f$, 7-5y^2$$, bijective, cardinality, function
    • Replies: 0
    • Views: 276
    December 8th, 2014, 14:54 Go to last post

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