# S.O.S. Mathematics CyberBoard

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flyingvshredder

2

75

Tue, 14 May 2013 08:19:10 UTC

Umbral calculus with negative indices (and powers)

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glebovg

26

359

Sun, 12 May 2013 00:51:54 UTC

SETS

cbella30

4

194

Mon, 29 Apr 2013 01:41:28 UTC

Find the coefficient of x^6 in the expansion of (2+x^3)^10

DgrayMan

9

189

Sun, 28 Apr 2013 22:16:44 UTC

Finding the best big O function

DgrayMan

8

384

Mon, 1 Apr 2013 00:43:45 UTC

Sum and difference identities

JessiciaG

1

183

Mon, 25 Mar 2013 00:34:29 UTC

Need help proving... something

Joskip

8

439

Sat, 23 Mar 2013 13:01:06 UTC

Binary operatins that satisfy the commutative property...

5

314

Sat, 16 Mar 2013 21:08:16 UTC

prove these..

mshou

1

248

Fri, 1 Mar 2013 19:27:04 UTC

Prove by induction n^3 > 2n + 1 n>=2. I've gotten stuck!

math911

1

285

Sat, 23 Feb 2013 03:04:02 UTC

Example on Laplacians of Graphs

M.A

4

474

Wed, 6 Feb 2013 15:29:58 UTC

Indicator identity for countable unions

Justin

6

471

Mon, 4 Feb 2013 12:40:31 UTC

Combinatorics problem envolving character sequences

Wall-E

0

345

Sun, 27 Jan 2013 23:37:35 UTC

is the following reasoning correct?

idi

4

447

Sat, 26 Jan 2013 20:16:07 UTC

Find the complement of a set

shuxue

2

423

Tue, 8 Jan 2013 12:50:13 UTC

Expresing given sets with predicate

Housslv

1

492

Tue, 18 Dec 2012 16:16:54 UTC

Image of a homomorphism

John Williams

8

909

Thu, 13 Dec 2012 16:54:51 UTC

Real Analysis

cloeannx3

1

438

Wed, 5 Dec 2012 02:03:33 UTC

Group Theory-symmetry of a triangular prism

John Williams

1

679

Tue, 4 Dec 2012 19:34:27 UTC

Combining intersections and unions of sets

Justin

14

1297

Tue, 20 Nov 2012 16:20:50 UTC

Discrete Math: Division Algorithm Proof

HKCHaN92

1

560

Fri, 16 Nov 2012 01:40:04 UTC

equivalence in absolute values

idi

6

765

Mon, 12 Nov 2012 00:49:47 UTC

formalizing a definition

[ Go to page: 1, 2 ]

idi

16

1370

Sun, 11 Nov 2012 04:51:39 UTC

Logic exercise.

Casual

1

520

Wed, 7 Nov 2012 15:59:37 UTC

Housslv

4

571

Tue, 6 Nov 2012 22:30:07 UTC

HKCHaN92

5

740

Tue, 6 Nov 2012 08:37:33 UTC

Predicate logic

Housslv

0

618

Thu, 1 Nov 2012 15:32:26 UTC

Show a set is compact

DgrayMan

6

945

Wed, 31 Oct 2012 15:00:16 UTC

Open and Closed Sets.

DgrayMan

6

766

Sun, 28 Oct 2012 13:22:36 UTC

Discrete Math: Direct Proof of a Tautology

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RaenirSalamander

16

1569

Wed, 24 Oct 2012 15:24:07 UTC

Question regarding mathematical logic

Housslv

4

728

Wed, 17 Oct 2012 14:30:01 UTC

Logic Books for Math-Major Freshman

kooyewyoung

3

780

Wed, 10 Oct 2012 17:04:19 UTC

Sequences

DgrayMan

2

596

Mon, 1 Oct 2012 15:39:56 UTC

On intervals

DgrayMan

3

663

Sun, 30 Sep 2012 02:29:04 UTC

On subgraphs of regular graphs

W_Blas

2

760

Sat, 22 Sep 2012 23:48:48 UTC

Generating Function Questions

rdj5933mile5math64

3

1145

Sun, 5 Aug 2012 04:55:24 UTC

Discrete maths question about relations...reflective, symmte

KennyAl

2

1565

Thu, 2 Aug 2012 23:38:21 UTC

Sets

glebovg

4

1041

Thu, 26 Jul 2012 01:45:31 UTC

Axioms

glebovg

12

1616

Wed, 18 Jul 2012 23:45:17 UTC

Concept on sets

johndoe

11

1184

Mon, 16 Jul 2012 05:27:13 UTC

Non-Standard Theories?

S4M

3

903

Mon, 9 Jul 2012 18:12:37 UTC

Irrational numbers

glebovg

3

774

Sat, 7 Jul 2012 05:48:36 UTC

Primes

glebovg

2

724

Tue, 3 Jul 2012 18:16:04 UTC

Intersecting Committees

rdj5933mile5math64

6

1151

Sat, 16 Jun 2012 17:10:01 UTC

discrete mathematics "3 value logic" help

samaha

3

1267

Fri, 8 Jun 2012 21:36:42 UTC

Graph theory

kirish

2

816

Mon, 4 Jun 2012 13:50:30 UTC

permutation

shobhit

6

1457

Fri, 18 May 2012 21:59:31 UTC

Conrguence (integers modulo m)

DgrayMan

5

1441

Sat, 5 May 2012 05:39:56 UTC

Sets and Relation BASIC

GoldenPho

3

902

Mon, 23 Apr 2012 04:04:13 UTC

Can You Name This Algorithem? Transform it?

enelson

2

977

Mon, 2 Apr 2012 04:37:44 UTC

Examples of Equivalence Relations.

DgrayMan

8

1831

Thu, 22 Mar 2012 23:46:55 UTC

Partitions

DgrayMan

10

1770

Tue, 20 Mar 2012 03:34:43 UTC

Set Relations

ResidentBiscuit

2

1019

Wed, 14 Mar 2012 20:25:57 UTC

Welcome, am I at the right spot?

ResidentBiscuit

6

1416

Wed, 22 Feb 2012 21:03:31 UTC

Showing a Function is Convex

beanmath

5

1580

Tue, 14 Feb 2012 22:30:51 UTC

Modus ponens proof

John Williams

2

1291

Sat, 4 Feb 2012 00:11:25 UTC

Census-taker and days of the month

westworld

1

1156

Wed, 1 Feb 2012 03:50:13 UTC

Spinning Balls

westworld

3

1396

Tue, 31 Jan 2012 19:09:44 UTC

Next number in a sequence

westworld

1

903

Mon, 30 Jan 2012 04:54:20 UTC

Injective Fnuction

salman

1

1087

Sun, 29 Jan 2012 13:55:43 UTC

Filling a swimming pool with 4 faucets together

Kodwo

4

1767

Fri, 20 Jan 2012 04:27:28 UTC

question

ely_en

2

1036

Thu, 19 Jan 2012 05:14:23 UTC

Subgroup unique of 12 elements of permutations

eraldcoil

5

1880

Mon, 12 Dec 2011 01:50:03 UTC

Possible combinations of 2/3 pointers in B.Ball Game

Kodwo

1

1086

Sun, 4 Dec 2011 19:43:14 UTC

Regularity of a finite projective plane

qleak

1

1310

Thu, 1 Dec 2011 19:00:43 UTC

show that

vijay1729

2

1291

Wed, 30 Nov 2011 18:00:22 UTC

Combinations of two-element set

roat00

3

1485

Sat, 12 Nov 2011 12:00:37 UTC

Pigeonhole principle

[ Go to page: 1, 2 ]

aceminer

21

3912

Wed, 9 Nov 2011 08:51:36 UTC

uncountable sets

ely_en

9

2343

Tue, 8 Nov 2011 18:14:14 UTC

Help solving this system of recurrance relations

GGG

7

1887

Tue, 1 Nov 2011 03:26:04 UTC

URGENT!!! Relation that is asymmetric, symmetric and

aceminer

5

1684

Mon, 24 Oct 2011 22:04:08 UTC

CANTOR-no bijection from S to P(S)

ely_en

3

1446

Mon, 24 Oct 2011 16:48:40 UTC

How to draw a Venn diagram of ((a=>b)=>a)=>a?

VnnE4aEXxfhkrjPi

10

2378

Wed, 19 Oct 2011 02:23:12 UTC

Cartesian Product proof

jstarks4444

2

1296

Mon, 17 Oct 2011 01:07:45 UTC

De Morgan's Laws proof

jstarks4444

2

1497

Mon, 17 Oct 2011 00:55:50 UTC

Logic-Time

Kodwo

7

1948

Mon, 3 Oct 2011 01:34:48 UTC

Logic

Kodwo

3

1615

Sat, 1 Oct 2011 23:59:34 UTC

Logic

Kodwo

3

1356

Wed, 28 Sep 2011 16:51:22 UTC

Venn diagram question

Kodwo

2

1229

Mon, 26 Sep 2011 14:45:27 UTC

Pattern and Relations-Logical Reasoning

Kodwo

1

1169

Mon, 26 Sep 2011 03:06:34 UTC

Closure relations on a language?

LostProjectile

3

1635

Thu, 8 Sep 2011 19:08:32 UTC

Combinatorics problem I cant seem to solve :(

Wernert

7

2273

Wed, 7 Sep 2011 14:11:51 UTC

Root N is irational

aceminer

11

2788

Wed, 7 Sep 2011 04:35:49 UTC

axiomatization of real numbers

jozou

2

1380

Tue, 6 Sep 2011 03:44:52 UTC

can some1 explain this proof to me?

aceminer

8

2701

Thu, 25 Aug 2011 16:56:08 UTC

Propositional logic

aceminer

11

2671

Sun, 21 Aug 2011 08:02:09 UTC

Urgent assistance required!

aceminer

10

2591

Sat, 20 Aug 2011 18:43:42 UTC

If a and b are real numbers and ab=0, then a=0 or b=0

kooyewyoung

1

1749

Sun, 14 Aug 2011 10:52:06 UTC

Interesting Combinatorial Identity -- need a proof

yoyobarn

2

1454

Tue, 2 Aug 2011 14:08:44 UTC

Handshake Theorem for Non-simple graphs

yoyobarn

2

1895

Wed, 6 Jul 2011 10:57:01 UTC

question

6

2232

Tue, 5 Jul 2011 23:21:45 UTC

Checking if a number is not rational

mathtinkerer

2

1597

Tue, 5 Jul 2011 01:07:49 UTC

infinite set

kooyewyoung

1

1489

Fri, 10 Jun 2011 21:43:51 UTC

Set theory. Is the converse true?

omoplata

1

1582

Fri, 10 Jun 2011 18:37:11 UTC

"Mathematical Logic" by Cori and Lascar: Incomplet

omoplata

0

1699

Fri, 3 Jun 2011 15:49:39 UTC

Mathematical Logic by Cori and Lascar : Possible typo?

omoplata

0

1612

Thu, 2 Jun 2011 16:57:23 UTC

andi_3k

4

2420

Thu, 2 Jun 2011 02:53:58 UTC

eraldcoil

1

1635

Tue, 24 May 2011 04:00:12 UTC

Some proofs that look rather trivial?

mathtinkerer

6

2663

Sun, 15 May 2011 05:26:08 UTC

mathtinkerer

3

1749

Sun, 15 May 2011 02:03:43 UTC

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