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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: 3,071
    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: 3,313
    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: 1,681
    January 27th, 2012, 23:00 Go to last post
  1. Normal Thread Normal Threads

  2. Could the Cartesian Product be finite?

    Started by evinda, January 18th, 2015 20:45
    countable, langle, omega, surjective, times
    • Replies: 0
    • Views: 266
    January 18th, 2015, 20:45 Go to last post
  3. The set is at most countable

    Started by evinda, January 18th, 2015 17:46
    $x$, neq, omega, proof, varnothing$
    • Replies: 0
    • Views: 360
    January 18th, 2015, 17:46 Go to last post
  4. Asymptotics

    Started by evinda, January 13th, 2015 19:40
    $forall, geq, mathbbn_0$, means, show
    • Replies: 5
    • Views: 444
    January 16th, 2015, 13:54 Go to last post
  5. How can we show that the inverse is bijective?

    Started by evinda, January 13th, 2015 14:16
    2 Pages
    1 2
    $f$, bijective, neq, omega$, show
    • Replies: 14
    • Views: 787
    January 13th, 2015, 18:26 Go to last post
  6. Each subset of the natural numbers is finite or countable

    Started by evinda, January 13th, 2015 17:36
    $x$, bounded, finite, i.e, subset
    • Replies: 0
    • Views: 297
    January 13th, 2015, 17:36 Go to last post
  7. The set is countable

    Started by evinda, January 13th, 2015 13:22
    • Replies: 4
    • Views: 445
    January 13th, 2015, 15:33 Go to last post
  8. Properties - Multiplication

    Started by evinda, January 9th, 2015 20:18
    cdot, multiplication, omega, omega$, properties
    • Replies: 4
    • Views: 439
    January 13th, 2015, 07:33 Go to last post
  9. How can we show that h is surjective?

    Started by evinda, January 13th, 2015 06:44
    $$$$, finite, injective, rightarrow
    • Replies: 0
    • Views: 316
    January 13th, 2015, 06:44 Go to last post
  10. The intervals are equinumerous

    Started by evinda, January 10th, 2015 19:09
    2 Pages
    1 2
    equinumerous, intervals, mathbbr$, show
    • Replies: 10
    • Views: 705
    January 12th, 2015, 20:13 Go to last post
  11. Properties of natural numbers

    Started by evinda, January 9th, 2015 10:38
    2 Pages
    1 2
    natural, numbers, omega, omega$, properties
    • Replies: 16
    • Views: 831
    January 12th, 2015, 15:16 Go to last post
  12. Constitution of real numbers

    Started by evinda, January 10th, 2015 18:13
    numbers, omega$, rational, relation, set
    • Replies: 1
    • Views: 349
    January 12th, 2015, 07:58 Go to last post
  13. The subsets of finite sets are finite sets.

    Started by evinda, January 11th, 2015 09:04
    finite, function, set, sets, show
    • Replies: 0
    • Views: 379
    January 11th, 2015, 09:04 Go to last post
  14. Constitution of integers

    Started by evinda, January 9th, 2015 20:40
    3 Pages
    1 2 3
    $langle, integers, rangle
    • Replies: 28
    • Views: 1,208
    January 10th, 2015, 17:50 Go to last post
  15. 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: 811
    January 9th, 2015, 15:12 Go to last post
  16. The order I_A

    Started by evinda, December 23rd, 2014 15:04
    $a$, element, greatest, minimal, order
    • Replies: 9
    • Views: 571
    January 8th, 2015, 17:10 Go to last post
  17. Do we have to check this case?

    Started by evinda, January 7th, 2015 18:03
    $n$, i.e, natural, number, successor
    • Replies: 8
    • Views: 533
    January 8th, 2015, 14:53 Go to last post
  18. Show that a is the least

    Started by evinda, December 23rd, 2014 14:51
    show, wave
    • Replies: 2
    • Views: 433
    January 8th, 2015, 06:03 Go to last post
  19. Propositions

    Started by evinda, December 17th, 2014 17:23
    holds, leftrightarrow, leq, numbers
    • Replies: 3
    • Views: 493
    January 7th, 2015, 19:13 Go to last post
  20. 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: 448
    January 7th, 2015, 17:50 Go to last post
  21. 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: 819
    January 7th, 2015, 17:37 Go to last post
  22. Natural numbers

    Started by evinda, January 1st, 2015 15:09
    4 Pages
    1 2 3 ... 4
    natural, numbers, rightarrow, subset, subsetneq
    • Replies: 30
    • Views: 1,664
    January 7th, 2015, 12:04 Go to last post
  23. 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: 427
    January 5th, 2015, 10:03 Go to last post
  24. 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: 717
    January 4th, 2015, 14:15 Go to last post
  25. Prove relations

    Started by evinda, January 1st, 2015 12:55
    $d0$, div, fraced, prove, rfloor$
    • Replies: 4
    • Views: 379
    January 3rd, 2015, 14:49 Go to last post
  26. 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: 360
    January 1st, 2015, 15:28 Go to last post
  27. Basic Set Theory - Notation

    Started by Rido12, January 1st, 2015 04:23
    $bbbr^3$, ambigious, dimension, i.e, x^2-1right$$
    • Replies: 2
    • Views: 332
    January 1st, 2015, 14:28 Go to last post
  28. There is a unique inductive set

    Started by evinda, December 5th, 2014 12:08
    2 Pages
    1 2
    • Replies: 11
    • Views: 741
    December 30th, 2014, 22:07 Go to last post
  29. 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: 778
    December 30th, 2014, 20:56 Go to last post
  30. 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: 371
    December 30th, 2014, 17:50 Go to last post
  31. 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: 1,356
    December 24th, 2014, 17:14 Go to last post

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