Mathematics

Mathematics

Problem

Let

A=\{a,b\}

and

B=\{1,2,3\}

. Define

R=\{(a,1),(b,2)\},\qquad S=\{(a,1),(a,2),(b,2),(b,3)\}.

Which one of the following statements is true? a)

S

is a subrelation of

R

. b) Both

R

and

S

are functions from

A

to

B

. c)

R

is a subrelation of

S

. d)

R

and

S

are not comparable by set inclusion.

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