Why $e^0=I$ for exponential operator?
88386
Derivative of matrix exponential at $0$
141685
Why is expectation defined by $\int xf(x)dx$?
141540
What is wrong with the following "proof" that $e=1$?
77486
What is the value of $i^i$?
38266
How to prove that exponential kernel is positive definite?
52791
Invertibility of an operator $T$ if $\|I-T\|<1$
73406
Prove that $E_{\lambda}(T)=E_{\lambda^{-1}}(T^{-1})$ if $T$ is an invertible linear operator on a finite dimensional vector space $V$
122603
How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?
74207
What is $i$ exponentiated to itself $i$ times?
38839
Exponential of the differential operator
18201
Why isn't the derivative of $e^x$ equal to $xe^{(x-1)}$?
46144
Understanding imaginary exponents
59929
Why is $(e_n)$ not a basis for $\ell_\infty$?
2635
equality of two operators...
121109
Why does the Taylor expansion of $e^x$ satisfy exponential properties?
5350
Explain why $E(|X|^p)=p\int_{0}^{\infty}y^{p-1}P(|X|>y) dy$
60721
How does $e^{i x}$ produce rotation around the imaginary unit circle?