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Most answered questions in Discrete Mathematics
0
votes
0
answers
5191
Propositional_26_4
BOB
asked
in
Mathematical Logic
Dec 25, 2018
by
BOB
172
views
0
votes
0
answers
5192
Are proofs important at this time while I am preparing Engineering Mathematics?
Good Morning I am preparing Engineering Mathematics now and as the time is less, does proofs matters to learn? Thank you in Advance
sambana
asked
in
Mathematical Logic
Dec 24, 2018
by
sambana
730
views
preparation
linear-algebra
discrete-mathematics
0
votes
0
answers
5193
Lattice. stuck
Let $S = (0, 1)$ and define the partial order relation R on $S X S$ as follows: ((a, b) R (c, d) if (a < c) $\wedge$ (a = c $\wedge$b <= d)) Consider the following preposition: $S_1$: R is not lattice. $S_2$: R is not complemented lattice but lattice $S_3$: R is complemented lattice. Which of the following statements is correct? Only s1 Only s2 Only s3
`JEET
asked
in
Mathematical Logic
Dec 24, 2018
by
`JEET
241
views
1
vote
0
answers
5194
#poset #lattice
Let A = {$2^n | n$ is a positive integer}. A relation R on A is defined by $a^Rb$ $\iff$ a is a divisor of b. Then the set A with respect to R is_________. (A) a poset but not a lattice (B) a lattice but not a distributive lattice (C) a distributive lattice but not bounded lattice (D) not a poset.
`JEET
asked
in
Mathematical Logic
Dec 24, 2018
by
`JEET
318
views
1
vote
0
answers
5195
Preposition Logic. Stuck.
Which of the following is valid? (A) {~p, p $ \to $ q, q $\to$ r} $\implies$ ~r (B) {p $ \to $ q, q $\to$ r, r} $\implies$ p (C) { p $\to$ (q $\to$ r), (p $\wedge$ q)} $\implies$ r How to proceed in such question.
`JEET
asked
in
Set Theory & Algebra
Dec 24, 2018
by
`JEET
397
views
0
votes
0
answers
5196
Find if the given function is bijective or not.
Which of the following is a bijection on set of all real numbers. $(1)f(x) = x{^2} $ $(2)g(x) = |x|$ $(3)h(x) = \left \lfloor x \right \rfloor$ $(4)\phi(x)$ = $x^3$ How to proceed in such questions.
`JEET
asked
in
Set Theory & Algebra
Dec 24, 2018
by
`JEET
275
views
0
votes
0
answers
5197
Made easy
garimanand
asked
in
Mathematical Logic
Dec 23, 2018
by
garimanand
172
views
0
votes
0
answers
5198
Made easy
please give me some example which can disapprove 2nd statement
garimanand
asked
in
Mathematical Logic
Dec 23, 2018
by
garimanand
195
views
0
votes
0
answers
5199
ME Test Series
Shadan Karim
asked
in
Graph Theory
Dec 23, 2018
by
Shadan Karim
244
views
2
votes
0
answers
5200
Self Doubt
∀x(∀z(β)→∃y(¬α)) ⟹∀x(¬∀z(β)∨∃y(¬α)) ⟹¬∃x¬(¬∀z(β)∨∃y(¬α)) ⟹¬∃x(∀z(β)∧¬∃y(¬α)) ⟹¬∃x(∀z(β)∧∀y(α)) In the third line why 2 negations are used ?
closed
Shamim Ahmed
asked
in
Mathematical Logic
Dec 23, 2018
by
Shamim Ahmed
262
views
first-order-logic
0
votes
0
answers
5201
Equivalence Relation
Consider the following relations: $R_1: ((a, b), (c, d)) belongs to R $ iff a + d = b + c $R_2: ((a, b), (c, d)) belongs R$ iff ad = bc Which of the following is equivalence relation.
`JEET
asked
in
Set Theory & Algebra
Dec 23, 2018
by
`JEET
280
views
0
votes
0
answers
5202
Functions
Consider the following function $ f(x) = \frac{x} {2x+1} $ $x \ne \frac{-1} {2}$ Which of the flowing is true? A If f is defined for R → R then f is not one to one. B If f i defined for R → R then f is not onto C If f is defined for R → R the f is bijection
`JEET
asked
in
Set Theory & Algebra
Dec 23, 2018
by
`JEET
630
views
0
votes
0
answers
5203
Functions Question
Let f: A -> B be a function and S and T be subsets of B. Consider the following statements about image(range): $S_2$: $f^{-1}(S\cup T)= f^-{1} (S) U f^{-1}(T)$ $S_2: f^{-1} (S \cap T ) = f^{-1}(S)\cap f^{-1}(T)$ Which of the following is equivalence relation? A $ Only R_1$ B $Only R_2$ C $Both R_1 and R_2$
`JEET
asked
in
Set Theory & Algebra
Dec 23, 2018
by
`JEET
152
views
0
votes
0
answers
5204
Graph Theory
Consider G be a directed graph whose vertex set is a set number from 2 to 120. There is an edge from vertex a to vertex b if b = k * a. Where k is any natural number. Then the number of connected components are___________. How to proceed with such questions
`JEET
asked
in
Graph Theory
Dec 23, 2018
by
`JEET
554
views
1
vote
0
answers
5205
https://gateoverflow.in/33989/how-to-solve-below-recurrence-relation
https://gateoverflow.in/33989/how-to-solve-below-recurrence-relation
closed
mitesh kumar
asked
in
Combinatory
Dec 22, 2018
by
mitesh kumar
212
views
recurrence-relation
discrete-mathematics
1
vote
0
answers
5206
Zeal Test Series 2019: Set Theory & Algebra - Functions
I think only d) is correct
Prince Sindhiya
asked
in
Set Theory & Algebra
Dec 22, 2018
by
Prince Sindhiya
748
views
set-theory&algebra
functions
discrete-mathematics
zeal
zeal2019
0
votes
0
answers
5207
Keneth Rosen
Determine whether each of these statements is true or false. 0 ∈ ∅ ∅ ∈ {0} {0} ⊂ ∅ ∅ ⊂ {0} {0} ∈ {0} {0} ⊂ {0} {∅} ⊆ {∅}
BharathiCH
asked
in
Set Theory & Algebra
Dec 22, 2018
by
BharathiCH
200
views
1
vote
0
answers
5208
Zeal Test Series 2019: Set Theory & Algebra - Sets
Prince Sindhiya
asked
in
Set Theory & Algebra
Dec 21, 2018
by
Prince Sindhiya
473
views
discrete-mathematics
group-theory
zeal
zeal2019
0
votes
0
answers
5209
GAte zeal module
Find a positive integer n such that given any set N with size|N|=n, then the number of reflexive relations on N is equal to number of symmetric relations on N______? i am getting n=3, please check
Prince Sindhiya
asked
in
Set Theory & Algebra
Dec 21, 2018
by
Prince Sindhiya
518
views
relations
0
votes
0
answers
5210
DOUBT ABOUT SYLLABUS
IS ring field and integral domain are there in syllabus
Prince Sindhiya
asked
in
Set Theory & Algebra
Dec 21, 2018
by
Prince Sindhiya
211
views
syllabus
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