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Let $T:V\to V$. The matrix $T$ is diagoniable if and only if there is a basis for $V$ consisting of eigenvectors of $T$. In fact, for a finite dimensional vector space and $T:V\to V$ linear, the following are equivalent:
- $T$ is diagonalizable
- The characteristic polynomial of $T$ is $P_T(t)=(\mu_1-t)^{n_1}\dots (\mu_k-t)^{n_k}$, and $\text{dim}E_{\mu_i}=n_i$, where the $\mu_i$'s are distinct
- $\text{dim}E_{\mu_1}+\text{dim}E_{\mu_k}=\text{dim}V$
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Let $T:V\to V$. The matrix $T$ is diagoniable if and only if there is a basis for $V$ consisting of eigenvectors of $T$. In fact, for a finite dimensional vector space and $T:V\to V$ linear, the following are equivalent:
- $T$ is diagonalizable
- The characteristic polynomial of $T$ is $P_T(t)=(\mu_1-t)^{n_1}\dots (\mu_k-t)^{n_k}$, and $\text{dim}E_{\mu_i}=n_i$, where the $\mu_i$'s are distinct
- $\text{dim}E_{\mu_1}+\text{dim}E_{\mu_k}=\text{dim}V$
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