Definitions in the book by Friedberg.
A linear operator $T$ on a finite-dimensional inner product space is called positive definite if $T$ is self-adjoint and $\langle T(x),x\rangle >0$ for all $ \neq 0$. An $n\times n$ matrix $A$ with entries from $\mathbb R $ or $\mathbb C$ is called positive definite if $L_A$ is positive definite.
Question
Is the definition of positive definite matrix defined with respect to the dot product of $\mathbb R $ or $\mathbb C$?
Do the definition of positive definite matrix depends on what inner product of $\mathbb R $ or $\mathbb C$ is given?
Thanks.