Is T a Linear Transformation from V to R1?

AI Thread Summary
The discussion centers on proving that the transformation T, defined as the integral of a continuous function f over the interval [0,1], is a linear transformation from the space of continuous functions V to the real numbers R1. The proof demonstrates linearity by showing that T(f + g) equals Tf + Tg and T(kf) equals kTf, confirming that T satisfies the properties of linearity. The poster seeks validation for their proof and expresses concern about potentially missing nuances in the definition of the transformation. A response clarifies that the notation f: V → R indicates that the integral of a function in V results in a real number. Overall, the proof is affirmed as correct and straightforward.
discoverer02
Messages
138
Reaction score
1
I'd like to check my proof. It seems easy enough, but I'd like to make sure that I'm not missing anything:

If V is the space of all continuous functions on [0,1] and if
Tf = integral of f(x) from 0 to 1 for f in V, show that T is a linear transformation From V into R1.

Like I said the proof seems simple enough, but I just want to make sure I'm not missing anything that might be implied by "From V into R1."

T(f + g) = integral from 0 to 1[f(x) + g(x)]dx
= integral from 0 to 1 f(x)dx + integral from 0 to 1 g(x)dx
= Tf + Tg

T(kf) = integral from 0 to 1 kf(x)dx
= k*integral from 0 to1 f(x)dx
= kTf

there for T is a linear transformation.

I feel silly posting something this simple, but I'm just not absolutely sure that I'm not missing something.

Thanks as usual for all the help.
 
Physics news on Phys.org
Yeah, that looks fine.

f:V \rightarrow\ R just refers to the fact that the definite integral over a function in V will always give you a constant real number.
 
Thanks Stevo.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top