# Limit notation question

• I
• KUphysstudent
In summary, the notation Limh→0+ (f(rh,h))/h indicates taking the limit of a function f with two variables at a specific point, where the second variable approaches 0 from the positive side. The notation suggests evaluating the function at the point (rh,h) and then taking the limit after dividing the result by h. This notation may be unfamiliar, but it is a simple concept.

#### KUphysstudent

Limh→0+ (f(rh,h))/h
Is the f(rh,h) part the same as f(r+h)-f(h)? I have never seen this before and googling for a long time didn't help, there are no videos with this notation and it's not in my book so, am I just to assume it is? because it doesn't look like it should be the same.

Anyone know what f(rh,h) means? :)

KUphysstudent said:
Limh→0+ (f(rh,h))/h
Is the f(rh,h) part the same as f(r+h)-f(h)? I have never seen this before and googling for a long time didn't help, there are no videos with this notation and it's not in my book so, am I just to assume it is? because it doesn't look like it should be the same.

Anyone know what f(rh,h) means? :)

Is f a function of 2 variables?

Math_QED said:
Is f a function of 2 variables?
Yes it is, how did you know? :P

KUphysstudent said:
Yes it is, how did you know? :P

The notation suggested it.

The limit in your question is simply

##\lim_{h \to 0+} \frac{f(rh,h)}{h}##

This means that you evaluate ##f## in the point ##(rh,h)## and then take the limit after dividing the result by h.

Math_QED said:
The notation suggested it.

The limit in your question is simply

##\lim_{h \to 0+} \frac{f(rh,h)}{h}##

This means that you evaluate ##f## in the point ##(rh,h)## and then take the limit after dividing the result by h.

Oh it was this simple. I was afraid to get guess but thanks really helped me :)