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Recent questions tagged relations
1
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0
answers
181
Relation- Reflexive Irreflexive
$Let A = \{ 1,2,3\}\\ R = \{\{1,1\},\{2,2\},\{2,3\}\}$ Is the above relation neither reflexive nor irreflexive?
Tuhin Dutta
asked
in
Set Theory & Algebra
Dec 28, 2017
by
Tuhin Dutta
603
views
discrete-mathematics
set-theory&algebra
relations
13
votes
3
answers
182
relation
Number of relations $S$ over set $\{0,1,2,3 \}$ such that $(x,y) \in S \Rightarrow x = y$
Lakshman Bhaiya
asked
in
Set Theory & Algebra
Dec 27, 2017
by
Lakshman Bhaiya
44.5k
views
set-theory&algebra
relations
0
votes
1
answer
183
Question on Relations
A binary relation R on Z × Z is defined as follows: (a, b) R (c, d) iff a = c or b = d Consider the following propositions: 1. R is reflexive. 2. R is symmetric. 3. R is antisymmetric. Which one of the following statements is True?
Durgesh Singh
asked
in
Set Theory & Algebra
Dec 22, 2017
by
Durgesh Singh
2.0k
views
set-theory&algebra
relations
discrete-mathematics
2
votes
3
answers
184
DBMS :- Referential integrity constraints
select the correct statement from the following on referential integrity Select one: a. referential integrity constraints check whether the primary key, values are unique b. referential integrity constraints check whether an ... two relations in a schema d. referential integrity constraints are specified between entities having recursive relationship
rahul sharma 5
asked
in
Databases
Dec 17, 2017
by
rahul sharma 5
9.6k
views
databases
referential-integrity
relations
12
votes
2
answers
185
ISRO-DEC2017-2
Consider the set of integers $I.$ Let $D$ denote "divides with an integer quotient" (e.g. $4D8$ but not $4D7$). Then $D$ is Reflexive, Not Symmetric, Transitive Not Reflexive, Not Anti-symmetric, Transitive Reflexive, Anti-symmetric, Transitive Not Reflexive, Not Anti-symmetric, Not Transitive
gatecse
asked
in
Set Theory & Algebra
Dec 17, 2017
by
gatecse
4.4k
views
isrodec2017
set-theory&algebra
relations
0
votes
1
answer
186
No. of tables for ER diagram
How many minimum tables are required for this er diagram consisting of a many - many relation and total participation of one of the entities.? Can't i merge relation R and entity B? why?
aditya kuppa 1
asked
in
Databases
Dec 5, 2017
by
aditya kuppa 1
1.1k
views
gatebook-dbms
databases
er-to-relational
relations
2
votes
1
answer
187
Relational algebra
Consider the relations r1(P, Q, R) and r2(R, S, T) with primary keys P and R respectively. The relation r1 contains 2000 tuples and r2 contains 2500 tuples. The maximum size of the join r1⋈ r2 is equal to r2⋈ r1 true or false?
learner_geek
asked
in
Databases
Dec 3, 2017
by
learner_geek
1.7k
views
relational-calculus
joins
relations
relational-algebra
databases
2
votes
3
answers
188
relational algebra
Consider the following schema: Student (Sid, Sname, age) Course Info (Cid, Cname, Instructor SSN) Enroll (Sid, Cid, grade). The relational algebra expression for “find the Cid’s of courses enrolled by two different students” (no options)
shaurya vardhan
asked
in
Databases
Dec 3, 2017
by
shaurya vardhan
6.1k
views
databases
relational-algebra
relations
relational-calculus
2
votes
2
answers
189
#dbms relational algebra
Consider the following relations A, B and C: A Id Name Age 12 Arun 60 15 Shreya 24 99 Rohit 11 B Id Name Age 15 Shreya 24 25 Hari 40 98 Rohit 20 99 Rohit 11 C Id Phone Area 10 2200 02 99 2100 01 How many tuples does the result of the following relational algebra expression contain? Assume that the schema of A∪B is the same as that of A. (A∪B)⋈A.Id>40∧C.Id<15C
iarnav
asked
in
Databases
Dec 2, 2017
by
iarnav
818
views
databases
relational-algebra
relations
0
votes
1
answer
190
Relation and Functions
Let R is a relation define on set A = {1,2,3,4,5}. The R is symmetric, transitive and irreflexive. Then |R| =
aishwarydewangan
asked
in
Combinatory
Nov 27, 2017
by
aishwarydewangan
487
views
discrete-mathematics
relations
1
vote
0
answers
191
relational algebra question
Given two union compatible relations R1(A,B) and R2(C,D), what is the result of the operation R1 ⋈ (A=C∨B=D)R2? R1∪R2 R1×R2 R1–R2 R1∩R2
iarnav
asked
in
Databases
Nov 27, 2017
by
iarnav
1.2k
views
relational-algebra
databases
relations
joins
6
votes
2
answers
192
One to one relationship with total participation of one entity. Can a single table be formed?
I am confused whether we need to have 2 tables or a single table when 2 strong entities are in 1:1 relationship with one having complete participation. Ex: How is it possible that we join Person and ... Bank Account may refer to some of the Person records which may go away on joining Person and License.
Ashish Sharma 3
asked
in
Databases
Nov 24, 2017
by
Ashish Sharma 3
12.8k
views
databases
er-diagram
relations
rdbms
1
vote
3
answers
193
Difference between Anti and Asymmetric?
Parshu gate
asked
in
Set Theory & Algebra
Nov 18, 2017
by
Parshu gate
3.6k
views
discrete-mathematics
relations
0
votes
0
answers
194
Equivalence Relation
Which of the above are true. I think only 1st one is true. But the answer given is all are true.
Shubhanshu
asked
in
Set Theory & Algebra
Nov 15, 2017
by
Shubhanshu
453
views
discrete-mathematics
relations
equivalence-class
4
votes
2
answers
195
projection in relational algebra
For the relation instances A and B, A/B is the largest relation instance Q such that Q B ⊆ A. Consider A has exactly two fields x and y and B has just one field y with the same domain as in A. Division operation A/B is defined as the set of all x values (in the form of unary tuples) such ... A) - B) (C) πx(A) - πx((πx(A) B) - A) (D) πx(A) - πx((πx(B) A) - A)
Parshu gate
asked
in
Databases
Nov 11, 2017
by
Parshu gate
1.3k
views
relational-algebra
databases
relations
–1
vote
0
answers
196
MadeEasy Subject Test: Engineering Mathematics - Relations
https://gateoverflow.in/?qa=blob&qa_blobid=4574016360522535869 Is there any short way to do this type of question?
charul
asked
in
Set Theory & Algebra
Nov 6, 2017
by
charul
264
views
made-easy-test-series
discrete-mathematics
set-theory&algebra
relations
1
vote
1
answer
197
ace test series
If $A=\left \{ 1,2,3 \right \}$, then number of relations possible on $A$, which are neither reflexive nor symmetric is _____________
rohit vishkarma
asked
in
Set Theory & Algebra
Nov 1, 2017
by
rohit vishkarma
517
views
relations
0
votes
1
answer
198
Discrete Maths :- Relations
Check if the following relation is Antisymmetric,where R is defined on set of integers R ={ (x,y) | y=$x^i$, for some i $\varepsilon$ Z}
rahul sharma 5
asked
in
Set Theory & Algebra
Oct 28, 2017
by
rahul sharma 5
665
views
discrete-mathematics
set-theory&algebra
relations
3
votes
1
answer
199
Rossen: How to perform Composition on Directed Graph.
Given the directed graphs representing two relations, how can the directed graph of the union, intersection, symmetric difference, difference, and composition of these relations be found? As, we can easily find, union, ... :- https://math.stackexchange.com/questions/239897/draw-the-composition-of-directed-graphs But not explained clearly.
Shubhanshu
asked
in
Set Theory & Algebra
Oct 12, 2017
by
Shubhanshu
1.2k
views
set-theory&algebra
directed-graph
relations
2
votes
2
answers
200
Kenneth Rosen Edition 6th Exercise 7.1 Question 41 (Page No. 473)
How many of the 16 different relations on {0,1} contain the pair (0,1)?
Uma Maheswari
asked
in
Combinatory
Oct 7, 2017
by
Uma Maheswari
1.8k
views
relations
kenneth-rosen
discrete-mathematics
combinatory
1
vote
3
answers
201
Relations
Consider the set S = {a, b} and ‘L’ be a binary relation such that L = {all binary relations except reflexive relation set S}. The number of relation which are symmetric _______.
sunaina rawat
asked
in
Set Theory & Algebra
Oct 4, 2017
by
sunaina rawat
1.8k
views
relations
discrete-mathematics
0
votes
1
answer
202
UGC NET CSE | December 2009 | Part 2 | Question: 01
If she is my friend and you are her friend, then we are friends. Given this, the friend relationship in this context is ____________. (i) commutative (ii) transitive (iii) implicative (iv) equivalence (A) (i) and (ii) (B) (iii) (C) (i), (ii), (iii) and (iv) (D) None of these
rishu_darkshadow
asked
in
Set Theory & Algebra
Sep 16, 2017
by
rishu_darkshadow
673
views
ugcnetcse-dec2009-paper2
set-theory&algebra
relations
4
votes
1
answer
203
Equivalence and Inverse of Relation.
Proof the following statement. 1. If R1 and R2 are the equivalence relation on X then R1 $\cap$ $R2^{-1}$ (Inverse of R2) is also an equivalence relation. 2. If R is reflexive and transitive relation on X then R $\cap$ $R^{-1}$ is an equivalence relation.
Hemant Parihar
asked
in
Set Theory & Algebra
Sep 2, 2017
by
Hemant Parihar
1.6k
views
discrete-mathematics
relations
set-theory&algebra
0
votes
1
answer
204
relations
what is the Number of relations S over set {0,1,2,3} such that (x,y) belongs to S=> x=y
Aashish S
asked
in
Set Theory & Algebra
Aug 25, 2017
by
Aashish S
516
views
relations
set-theory&algebra
discrete-mathematics
2
votes
1
answer
205
Kenneth Rosen Edition 6th Exercise 7.5 Question 3 b,e (Page No. 507)
1- these relations on the set of all functions from Z to Z. Determine the properties they lack for equivalence relation? a) {(f, g) | f (0) = g(0) or f (1) = g(1)} b) {(f, g) | f (0) = g(1) and f (1) = g(0)}
vamp_vaibhav
asked
in
Mathematical Logic
Aug 10, 2017
by
vamp_vaibhav
499
views
kenneth-rosen
discrete-mathematics
relations
1
vote
1
answer
206
Relations
Consider the set {2,3,4} and define partial ordering if a divides b. Now element 3 is maximal or minimal.
Shivam Chauhan
asked
in
Set Theory & Algebra
Aug 6, 2017
by
Shivam Chauhan
279
views
relations
set-theory&algebra
1
vote
0
answers
207
Kenneth Rosen Edition 6th Exercise 7.5 Question 35 (Page No. 499)
Show that the closure with respect to the property P of the relation R = {(0, 0), (0, 1), (1, 1), (2, 2)} on the set {0, 1, 2} does not exist if P is the property a) is not reflexive. b) ... the relation already is reflexive we can't find a closure for "is not reflexive", but what is meant by closure in the 2nd part?
shraddha priya
asked
in
Set Theory & Algebra
Jul 26, 2017
by
shraddha priya
415
views
kenneth-rosen
discrete-mathematics
relations
set-theory&algebra
1
vote
1
answer
208
Relations: Doubt About Composites (Conceptual)
If R is any relation: is Rno R (composite of Rn and R) the same as R o Rn?
meghashyamc
asked
in
Set Theory & Algebra
Jul 23, 2017
by
meghashyamc
299
views
relations
1
vote
3
answers
209
DBMS Relational Algebra
How the following two expressions are equal? The LHS will remove duplicates but RHS will not.Please explain
rahul sharma 5
asked
in
Databases
Jul 13, 2017
by
rahul sharma 5
2.4k
views
relational-algebra
databases
relations
4
votes
1
answer
210
Relation and Partial order
Is (S, R) a poset if S is the set of all people in the world and (a, b) ∈ R, where a and b are people, if a is not taller than b?
ram_18051996
asked
in
Set Theory & Algebra
Jul 7, 2017
by
ram_18051996
2.5k
views
engineering-mathematics
relations
relational-algebra
partial-order
set-theory&algebra
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