prove that $ W=(W^\perp)^\perp$
15300
How to show that $(W^\bot)^\bot=W$ (in a finite dimensional vector space)
20964
Proof that $n^2 < 2^n$
20626
Prove that $x^y < y^x$
95513
Proving $W$ is a subspace of $P_{2}$
32589
Prove or disprove that Arg(zw)=Arg(z)+Arg(w)
15793
Is the formula $(\text{ker }A)^\perp=\text{im }A^T$ necessarily true?
134439
Proving function is $C^k$
95379
Prove that $V = V_1 \oplus V_2$ in the following
112080
Proving the Product Rule for exponents with the same base
156727
A step in the proof of Characterization of $W^{1,\infty}$
20407
Proof of Wolstenholme's theorem
20467
Show that $(y_n)\in l^q$
18477
$(W_1+W_2+\cdots+W_n)^a \leq W_1^a +\cdots + W_n^a$ for $n$ integer, $n\geq 2$, $W\gt 0$ and $a$ constant, real, $0\lt a\lt 1$
103839
Proving that $T^{2} = T$ for a linear operator on $W$ implies that $V = \operatorname{Null} T \oplus \operatorname{Range} T$
15232
Proving an inequality involving real powers
19424
Showing $(M^\perp)^\perp=\overline{M}$
145125
How to prove that $A^{-1} + B^{-1}$ is invertible given the conditions