Commutation relations $[\phi(x), \phi^\dagger (y)]=-i \Delta(x,y)$ for spacelike separations $(x-y)^2<0$
99244
A question about causality and Quantum Field Theory from improper Lorentz transformation
58562
How can we prove that $D(f)\backsimeq\operatorname{Spec} A_f$?
46669
How can I prove these are the adjoint operators?
2105
$\langle Tu\;|\;u\rangle=0,\;\forall u\in E \Longrightarrow T=0$?
91627
What is a primary decomposition of the ideal $I = \langle xy, x - yz \rangle$?
77951
Dirac's delta in 3 dimensions: proof of $\nabla^2(\|\boldsymbol{x}-\boldsymbol{x}_0\|^{-1})=-4\pi\delta(\boldsymbol{x}-\boldsymbol{x}_0)$
141167
What is $\int_{c}^{\infty}\Phi(a+bx) \phi( x ) dx$ for $c\in\mathbb{R}$
112398
Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions
38127
Equivalence between Kähler condition and $\partial_kg_{i\bar j} = \partial_ ig_{k\bar j}$
23174
Moyal Product in Non Commutative Quantum Mechanics
94077
Proof of linear independence of $e^{at}$
26249
Self adjoint operators and trace class property
34714
What is the relationship between $\ker(A), \ker(A^2), \ldots, \ker(A^n)$?
142892
Lagrangian Mechanics - Commutativity Rule $\frac{d}{dt}\delta q=\delta \frac{dq}{dt} $
88535
Relation between the distance from a point to the resolvent set of a self-adjoint operator and the norm of a related operator
151721
Uhlmann's Theorem: proof of $\text{tr}(A^{\dagger} B) = \langle m | A \otimes B |m\rangle $
86717
Completeness of $\langle \mathscr{C} [0, 1], \| \cdot \|_1 \rangle$