Why is f not a function from R to R if
a) f(x)=1/x ?
f(x) is not well-defined because there are two distinct values assigned to each x.
f(0) is not defined.
f(x) is not defined for x

Question

Why is f not a function from R to R if
a) f(x)=1/x ?
f(x) is not well-defined because there are two distinct values assigned to each x.
f(0) is not defined.
f(x) is not defined for x<0.

vortish · Answer

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vortish · Answer

i have  a done just need help with b

vortish · Answer

@Jhannybean help me with b please

vortish · Answer

(a) was f(0) not well defined

jhannybean · Answer

what do you think the answer is.

jhannybean · Answer

f(0) is not defined because you cannot divide by 0. That is right.

vortish · Answer

i thinking that b is f(x) not well define x<0

jhannybean · Answer

You are right.

vortish · Answer

ok thanks for the checking

jhannybean · Answer

no problem :)