$W$ is not equal to $W^{\perp\perp}$?
21459
Orthogonal complement examples
71500
Is the product of generators equal to the generator of the product?
130253
Differentiating $\mbox{tr} (ABA^TC)$ w.r.t. $A$
141799
Is $2^{|\mathbb{N}|} = |\mathbb{R}|$?
98470
If $A \ne \varnothing$, then $\varnothing^A=\varnothing$
103142
Question on equivalence of inner product
2635
equality of two operators...
81240
Norm of an inverse operator: $\|T^{-1}\|=\|T\|^{-1}$?
114346
Why is $a^{-1}$ mod $p$ equal to $a^{p-2}$ mod $p$?
95145
Does $\exp(2ir\pi)$ equal $1$? What's wrong?
75254
Properties possessed by $H , G/H$ but not G
94421
Why $P(A) \cup P(B)$ is not equivalent to $P(A \cup B)$
53610
What is the difference between $Q=\Delta U+W$ and $\Delta U=Q+W$?
22297
Normal operator $\Rightarrow$ S invariant implies $S^\perp$ invariant
137511
Trying to show that $\sup \{b^p:p\in Q,\;0<p<x\} = \inf\{b^q:q\in Q,\;x<q\}$
95513
Proving $W$ is a subspace of $P_{2}$
18160
How to show that the group of nonzero real numbers under multiplication is not isomorphic to the group of real numbers under addition?