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Recent questions tagged relations
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Recurrence Relation SelfDoubt
What will be solution of recurrence relation if roots are like this: r1=2, r2=2, r3=2, r4=2 is this the case of repetitive roots?
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May 14
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aditi19
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Rosen 7e Exercise9.6 Question no27 page no631
What is the covering relation of the partial ordering {(A, B)  A ⊆ B} on the power set of S, where S = {a, b, c}? i'm getting R={(Ф, {a}), (Ф, {b}), (Ф, {c}), (Ф, {a, b}), (Ф, {b, c}), (Ф, {a, c}), (Ф, {a, b, c}), ({a}, {a, b}), ({a}, {a, c}), ({b}, ... b, c}), ({c}, {a, c}), ({c}, {b, c}), ({a, b}, {a, b, c}), ({a, c}, {a, b, c})({b, c}, {a, b, c})
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May 10
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Set Theory & Algebra
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aditi19
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kennethrosen
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3
Raghuramkrishnan Exercise4.3 question 11 page no127 Relational Algebra
Suppliers(sid, sname, address) Parts(pid, pname, color) Catalog(sid, pid, cost) Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham
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May 8
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Databases
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aditi19
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4
Raghuramkrishnan Exercise4.3 page127
Given relation catalog(sid, pid, cost) Find pairs of sids such that the supplier with the first sid charges more for some part than the supplier with the second sid what is the relational algebra expression for this?
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May 7
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Databases
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aditi19
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POSET self doubt
What is dual of a POSET?
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Apr 27
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Set Theory & Algebra
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aditi19
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6
Rosen 7e Exercise9.5 Question no9 page no615
Suppose that $A$ is a nonempty set, and $f$ is a function that has $A$ as its domain. Let $R$ be the relation on $A$ consisting of all ordered pairs $(x, y)$ such that $f (x)=f (y)$ $a)$ Show that $R$ is an equivalence relation on $A$ $b)$ What are the equivalence classes of $R?$
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Apr 23
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Set Theory & Algebra
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aditi19
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7
Michael Sipser Edition 3 Exercise 0 Question 7 (Page No. 26)
For each part, give a relation that satisfies the condition. Reflexive and symmetric but not transitive Reflexive and transitive but not symmetric Symmetric and transitive but not reflexive
asked
Apr 13
in
Theory of Computation
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Lakshman Patel RJIT
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8
Raghuramkrishnan Exercise 4.1 Relational Algebra
Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2>N1> 0, give the minimum and maximum possible sizes (in tuples) for the result relation produced by each of the following relational algebra expressions. In each ... $σa=5(R1)$ (selection) $\pi a(R1)$ (projection) $R1/R2$ (division)
asked
Apr 11
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Databases
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9
#KennethRosen#DiscreteMaths
R is iff $R ^{1}$ is Total ? a function ? a surjection ? an injection ? a bijection ? Fill in the entries in the table.
asked
Mar 30
in
Set Theory & Algebra
by
Sumiran Agrawal
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91
points)

7
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relations
kennethrosen
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1
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10
General Topic Doubt Set Theory & Algebra: Relations
How to check a relation is transitive or not from its matrix representation? Please help me with an example.
asked
Mar 8
in
Set Theory & Algebra
by
Sona Barman
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1.2k
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11
Ace Test Series: Set Theory & Algebra  Relations
Let $A=\left \{ 1,2,3 \right \}$. Number of relation on $A$ which are neither reflexive, nor irreflexive but symmetric is ___________ Ans given 48 but I got 8 Please verify
asked
Mar 7
in
Set Theory & Algebra
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srestha
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154
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acetestseries
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4
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12
GATE 2019: Equivalent Relation
Which of the following equivalent relation of a group G? R 1 : ∀ a , b ∈ G , a R 1 b if only ∃ g ∈ G : a = g − 1 bg R 2 : ∀ a , b ∈ G , a R 2 b if only a = b –1 (a) Both R 1 and R 2 (c) R 1 (b) R 2 (d) None of these
asked
Feb 4
in
Set Theory & Algebra
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HeartBleed
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453
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328
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relations
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1
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13
Functions and Relations
What is the number of relations S over set {0,1,2,3} such that (x,y) $\epsilon$ S $\Rightarrow x = y$ ? Thanks.
asked
Jan 23
in
Set Theory & Algebra
by
Abhipsa Mishra
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83
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56
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settheory&algebra
relations
functions
discretemathematics
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1
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14
Relations
Consider the following relation: $R={(x,y) y=x^i, ∃ “i” in Z }$ R is i) Reflexive ii) Symmetric iii) Anti symmetric iv) Transitive Thanks!
asked
Jan 23
in
Set Theory & Algebra
by
Abhipsa Mishra
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83
points)

38
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settheory&algebra
relations
discretemathematics
+3
votes
1
answer
15
GATEBOOK2019 Mock Test114
On the set of all integers, let $(x,y)\in R$ iff $xy\geq 1.$ Is the relation R reflexive, symmetric, antisymmetric, transitive? Yes, No, No, Yes No, Yes, No, Yes No, No, No, Yes No, Yes, Yes, No
asked
Jan 19
in
Set Theory & Algebra
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GATEBOOK
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11.4k
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gb2019mock1
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16
ER to relation
Answer has R4 and E2 merged, I cant visualize how? what will be primary key? What will be other attributes?
asked
Jan 16
in
Databases
by
bts1jimin
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193
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relations
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erdiagram
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17
Gate2000
A relation R is defined on the set of integers as xRy iff (x+y) is even. Which of the following statements is true? A R is not an equivalence relation B R is an equivalence relation having 1 equivalence class C R is an equivalence relation having 2 equivalence classes D R is an equivalence relation having 3 equivalence classes Engineering Mathematics Sets and Relations
asked
Jan 10
in
Mathematical Logic
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balchandar reddy san
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18
Composition of a relation Madeeasy 2019
How to take composition of a Relation? here used concept of function but when to go with the transitivity rule concept as mentioned below? Please clarify in general when to use which method
asked
Jan 10
in
Mathematical Logic
by
Markzuck
Junior
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571
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73
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discretemathematics
relations
functions
settheory&algebra
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0
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19
MadeEasy Test Series: Set Theory & Algebra  Relations
asked
Jan 10
in
Mathematical Logic
by
Shankar Kakde
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147
points)

52
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madeeasytestseries
settheory&algebra
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1
answer
20
Reflexive Relation
Can anyone help …. where I am wrong…??
asked
Jan 8
in
Mathematical Logic
by
Vikas123
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333
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50
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relations
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0
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21
MadeEasy Test Series: Databases  Er Diagram
Identify total number of attributes in minimized relation ?
asked
Jan 6
in
Databases
by
Na462
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70
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22
Determine whether the relation is reflexive, symmetric, and/or transitive?
Let R be the relation on the set ‘N’ of strictly positive integers, where strictly positive integers x and y satisfy x R y iff x^2 – y^2 = 2^k for some nonnegative integer k. Which of the following statement is true with respect to R? I think it’s just reflexive, because it obeys reflexive conditions.
asked
Jan 2
in
Mathematical Logic
by
susgir2
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1.4k
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53
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2
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23
Zeal Test Series 2019: Set Theory & Algebra  Relations
The Number of Relations, Which are both Reflexive and Symmetric but not AntiSymmetric, on a set with 6 elements, are ____________? i got 32768 plz check
asked
Jan 2
in
Set Theory & Algebra
by
Prince Sindhiya
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zeal2019
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2
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24
Ace Test Series: Set Theory & Algebra  Relations
Ans:B Symmetric closure of R 1. It is symmetric 2. It contains R 3.Minimal relation satisfying 1 and 2 If we consider B, then condition 2 may be violated. Therefore I think the answer should be D.
asked
Dec 26, 2018
in
Set Theory & Algebra
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amitqy
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25
Number of AntiSymmetric Relations
Number of possible AntiSymmetric relations possible on a set of Size 5 whose size is maximum? My Work: Whose Size is maximum means, we should take all reflexive pairs. Okay, now we are left with $\frac{n(n1)}{2}$ offdiagonal pairs. We can have 3 ... must be $3^{\binom{5}{2}}$ But the answer was given to be 1024. Please guide me to the correct thought process.
asked
Dec 25, 2018
in
Mathematical Logic
by
Ayush Upadhyaya
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89
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relations
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26
GAte zeal module
Find a positive integer n such that given any set N with sizeN=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
asked
Dec 21, 2018
in
Set Theory & Algebra
by
Prince Sindhiya
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5.4k
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54
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relations
0
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0
answers
27
Self Doubt
Lets Two relations R1(P, Q, R) R2(R, S, T) .R1 contains 2500 tuples and R2 contains 2000 tuples Q1) R1(P, Q, R) R2(R, S, T) ..'R' is primary key in R1 and R is NOT FK in R2 MIN and MAX tuples in R1 * R2 .. (* ==> Natural Join) Q2) R1(P, Q, R) R2(R, S, T) ... Q, R) R2(R, S, T) ..'R' is NOT primary key in R1 and R is NOT FK in R2 MIN and MAX tuples in R1 * R2 .. (* ==> Natural Join)
asked
Dec 21, 2018
in
Databases
by
jatin khachane 1
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28
Relational Algebra dbms
asked
Dec 10, 2018
in
Databases
by
gatecrack
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231
points)

67
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relationalalgebra
databases
relations
relationalal
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1
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29
relation algebra
Consider a relation R(A, B) that contains r tuples, and a relation S(B, C) that contains s tuples; assume r > 0 and s > 0. Make no assumptions about keys. For the following relational algebra expression, in terms of r and s the minimum and maximum number of tuples that could be in the result?
asked
Dec 7, 2018
in
Databases
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ankuyadav17
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5
points)

87
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relationalalgebra
relations
0
votes
1
answer
30
Relation algebra Query
Consider the following relation and instance of relation: Supply(sid,Sname) #sid is key Parts(pid,Pname,Pcolor) #pid is the key Catalog(sid,pid) #sid,pid is the key Number of tuples returned by the above Query is ……...
asked
Dec 2, 2018
in
Databases
by
Na462
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