Explain the graphs , direct and inverse image . Rela
R. we say related
h and onen write it R h.
If X = Y. we say that R is rela•
lion on X.
Let R be a relation from X to
Y. For each subset A Of X, we
write
Fig. 1.5
{y e Y: x R y for some x A
and call it the (direct) image of A under R, and for each
subset B of Y, we write R-l (B) e X : x R y for some y
B} and call it the inverse image of B under R.
Fig. 1.6
One can think of as a relation from Y to X, where
refl
x

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