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Recent questions in Discrete Mathematics

2 votes

1 answer

5141

Kenneth Rosen Edition 6th Exercise 6.6 Question 3 (Page No. 456)
How many solution does the equation x1+x2+x3=13 have where x1 x2 and x3 are non negative less than 6 ?

Dexter asked in Combinatory Oct 21, 2016

by Dexter

600 views

0 votes

1 answer

5142

General Doubt
Which of the following is a mapping or total function 1) f is defined on RXR f(x)=1 ;x=5t, t ℇ Z =0 ;x=5t+1, t ℇ Z 2)1) f is defined on RXZ f(x)=1 ;x=5t, t ℇ Z =0 ;x=5t+1, t ℇ Z

Vasu_gate2017 asked in Set Theory & Algebra Oct 21, 2016

by Vasu_gate2017

237 views

0 votes

1 answer

5143

mathematics
here is the sol: in above sol no. of possible 4-pennant is 7 not 5.so it is not the fibonancci series closed

dileswar sahu asked in Combinatory Oct 21, 2016

by dileswar sahu

446 views

0 votes

1 answer

5144

mathematics
plz someone describe details of P & Q expression.............

dileswar sahu asked in Combinatory Oct 21, 2016

by dileswar sahu

333 views

1 vote

1 answer

5145

mathematics
In a simple graph G, if degree of each vertex is 3 then graph G is connected. True/False?

dileswar sahu asked in Graph Theory Oct 20, 2016

by dileswar sahu

302 views

2 votes

1 answer

5146

mathematics
is this solution is correct.I think either opt(a) or (c) is correct........

dileswar sahu asked in Graph Theory Oct 20, 2016

by dileswar sahu

347 views

3 votes

1 answer

5147

logic functions
Given $x,y,z$ are Boolean variables and $f(x,y,z)=f(y',x',z)$. How many such functions are possible with $x, y, z$? $0$ $2^2$ $2^4$ $2^6$

Shashank Chandekar asked in Set Theory & Algebra Oct 20, 2016

by Shashank Chandekar

548 views

1 vote

1 answer

5148

mathematics
plz someone explain.........

dileswar sahu asked in Set Theory & Algebra Oct 19, 2016

by dileswar sahu

323 views

1 vote

0 answers

5149

Need of Concept Clarity
I want to understand Validity Check in First order logic. Also I want to have technique or specific way of how to approach or answer GATE question on this topic? Please give Pure explanation. Detailed Answer. It would be great help for GATE aspirants like me. Thanks in Advance.

parthbkgadoya asked in Mathematical Logic Oct 19, 2016

by parthbkgadoya

266 views

0 votes

1 answer

5150

Graph
Is the topic "Planarity" there in GATE 2017 syllabus?

Samujjal Das asked in Graph Theory Oct 18, 2016

by Samujjal Das

296 views

1 vote

1 answer

5151

Graph Intersection

KISHALAY DAS asked in Graph Theory Oct 18, 2016

by KISHALAY DAS

415 views

0 votes

2 answers

5152

Prateek kumar asked in Mathematical Logic Oct 18, 2016

by Prateek kumar

364 views

–1 vote

1 answer

5153

Prateek kumar asked in Mathematical Logic Oct 18, 2016

by Prateek kumar

301 views

0 votes

1 answer

5154

Prateek kumar asked in Mathematical Logic Oct 18, 2016

by Prateek kumar

310 views

0 votes

1 answer

5155

Prateek kumar asked in Mathematical Logic Oct 18, 2016

by Prateek kumar

224 views

3 votes

2 answers

5156

Logic
Everyone has exactly one best friend Are all three below same? Let B(x, y) to be the statement “y is the best friend of x" $ ∀x∃y(B(x, y) ∧ ∀z((z = y)→¬B(x, z))) $ $ ∀x ∃!y (B(x, y) $ $ ∀x ∃y (B(x, y) ∧ ∀z (B(x, z) → (y = z))) $

Shivam Chauhan asked in Mathematical Logic Oct 18, 2016

by Shivam Chauhan

1.0k views

4 votes

0 answers

5157

Multiplicative inverse
Every real number except zero has a multiplicative inverse Are both the statements same? $ ∀x((x != 0) → ∃y(xy = 1)) $ $ ∀x ∃y ((x != 0) → (xy = 1)) $

Shivam Chauhan asked in Mathematical Logic Oct 18, 2016

by Shivam Chauhan

820 views

2 votes

2 answers

5158

Doubt
A $\phi$ (empty) relation on any set $A$ is not reflexive because for every $ a \in A$, $(a, a) \notin \phi$, but $\phi$ is a symmetric as well as transitive relation on $A$, how is that possible $?$

vivek9837 asked in Set Theory & Algebra Oct 17, 2016

560 views

2 votes

1 answer

5159

Prateek kumar asked in Mathematical Logic Oct 17, 2016

by Prateek kumar

516 views

2 votes

2 answers

5160

solve this paragrapgh

Prateek kumar asked in Mathematical Logic Oct 17, 2016

by Prateek kumar

296 views

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