MHB Emeril's question at Yahoo Answers (invariant subspace).

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The discussion revolves around proving that the image subspace R(T) is T-invariant for a linear transformation T: V → V. The key steps outlined include showing that for any x in R(T), there exists a u in V such that x = T(u), leading to T(x) being in T(V). This establishes that T(V) is indeed T-invariant. The conversation also references a link to Yahoo Answers for further assistance. The focus remains on the mathematical proof of T-invariance.
Fernando Revilla
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Hello Emeril,

Follow the steps
\begin{aligned}
x\in T(V)&\Rightarrow \exists u\in V:x=T(u)\\&\Rightarrow T(x)=T(T(u))\\&\Rightarrow T(x)\in T(V)\\&\Rightarrow T(V)\mbox{ is } T\mbox{-invariant}
\end{aligned}
 
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