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-- Mathematics - Section B1
Relations and Functions
a
b
c
d
$f(x)=x-4$
$f(x_1)=f(x_2)⇒x_1-4=x_2-4⇒x_1=x_2$ (ONE-ONE)
$y=x-4⇒y+4=x$ for every y there exists atleast one x (ONTO)