Example that in general $|abc|\neq |cba|$
107540
how to prove that $abc$ and $cba$ do not necessarily have the same order?
33851
Generalizing a sequence.
8920
There exists $C\neq0$ with $CA=BC$ iff $A$ and $B$ have a common eigenvalue
66563
Is $ (A∪B)×(C∩D)=(A∪C)×(B∪D)$ true for all sets A,B,C and D?
155884
What are the conditions on $\text{tr}(AB) \leq \text{tr(A)} \text{tr(B)}$ to be true?
62750
Constant case CRT: $\,x\equiv a\pmod{\! 2},\ x\equiv a\pmod{\! 5}\iff x\equiv a\pmod{\!10}$
139514
Can we construct $\Bbb C$ without first identifying $\Bbb R$?
152693
If $C|a$ and $C|b$ then $C|(ax+by)$
52882
find nonsingular matrices $B$ and $C$ that satisfy $BC+ CB= 0$
19909
if $abc=1$, then $a^2+b^2+c^2\ge a+b+c$
104274
Express $C$ interms of the sets $A_n$
76347
Shorter proof for some equvalences
101519
What is the condition for example $(number^c)^b=number^{cb}$ to be true?
128966
Explicit bijection between $\Bbb R$ and permutations of $\Bbb N$
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
48614
Why is "$P \Rightarrow Q$" equivalent to "$\neg Q \Rightarrow \neg P$"?
33633
Re:$ (a,b,c,d)=(pr+qs, qr-ps,pr-qs,ps+qr) $