Question

1. define null relation ?
2. if a= (2,-2,3) and b = (1,-4) then find a×b and b×a ?​

Answer 1

Answer:

1.The null relation is a relation R in S to T such that R is the empty set: R⊆S×T:R=∅ That is, no element of S relates to any element in T: R:S×T:∀(s,t)∈S×T:¬sRt.

2.a-3

b-3a

a*b-9

b*a-9