Visualizing relations; Functions as relations
6.1
Let A={0,1,2,3} and B= {a,b,c}
Let R be the following relation from A to B:
R = {(0,a), (0,b), (2,a), (3,b)}
Visualizing R:
0
a
1
b
2
c
3
A B
R is not a function!
A function from A to B
can be understood as a
relation F from A to B s.t.
for every element a of A
there is exactly one
element b of B with aFb.
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