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Recent questions tagged relations

1 votes
1 answer
181
Relation
For $a,b\epsilon Real$ define $aRb$ iff $a^{2}+b^{2}>2$.Is it Reflexive, Symmetric or Transitive?
For $a,b\epsilon Real$ define $aRb$ iff $a^{2}+b^{2}>2$.Is it Reflexive, Symmetric or Transitive?
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2 votes
1 answer
182
Relations
I'm getting 384....
I'm getting 384....
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1 votes
0 answers
183
Relation- Reflexive Irreflexive
$Let A = \{ 1,2,3\}\\ R = \{\{1,1\},\{2,2\},\{2,3\}\}$ Is the above relation neither reflexive nor irreflexive?
$Let A = \{ 1,2,3\}\\ R = \{\{1,1\},\{2,2\},\{2,3\}\}$Is the above relation neither reflexive nor irreflexive?
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13 votes
3 answers
184
relation
Number of relations $S$ over set $\{0,1,2,3 \}$ such that $(x,y) \in S \Rightarrow x = y$
Number of relations $S$ over set $\{0,1,2,3 \}$ such that $(x,y) \in S \Rightarrow x = y$
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0 votes
1 answer
188
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?
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 an...
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2 votes
1 answer
189
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?
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 s...
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2 votes
3 answers
190
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)
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...
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0 votes
1 answer
192
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| =
Let R is a relation define on set A = {1,2,3,4,5}. The R is symmetric, transitive and irreflexive. Then |R| =
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1 votes
0 answers
193
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
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∪R2R1×R2R1–R2R1∩R2
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0 votes
0 answers
196
Equivalence Relation
Which of the above are true. I think only 1st one is true. But the answer given is all are true.
Which of the above are true.I think only 1st one is true. But the answer given is all are true.
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1 votes
1 answer
199
ace test series
If $A=\left \{ 1,2,3 \right \}$, then number of relations possible on $A$, which are neither reflexive nor symmetric is _____________
If $A=\left \{ 1,2,3 \right \}$, then number of relations possible on $A$, which are neither reflexive nor symmetric is _____________
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0 votes
1 answer
200
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}
Check if the following relation is Antisymmetric,where R is defined on set of integersR ={ (x,y) | y=$x^i$, for some i $\varepsilon$ Z}
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1 votes
3 answers
203
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 _______.
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 symmet...
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0 votes
1 answer
206
relations
what is the Number of relations S over set {0,1,2,3} such that (x,y) belongs to S=> x=y
what is the Number of relations S over set {0,1,2,3} such that (x,y) belongs to S= x=y
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1 votes
1 answer
208
Relations
Consider the set {2,3,4} and define partial ordering if a divides b. Now element 3 is maximal or minimal.
Consider the set {2,3,4} and define partial ordering if a divides b.Now element 3 is maximal or minimal.
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1 votes
1 answer
210
Relations: Doubt About Composites (Conceptual)
If R is any relation: is Rno R (composite of Rn and R) the same as R o Rn?
If R is any relation:is Rno R (composite of Rn and R) the same as R o Rn?
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