Solve $ a!b!=a!+b!+c! $
89031
Solve $a!b!=a!+b!+c!$ where $a$, $b$ and $c$ are nonnegative integers.
63958
how to prove this inequality $(ab+bc+ac)^2 ≥ 3abc(a+b+c)$
140167
Proving $A+A'B=A+B$ without truth tables
21726
Show that if $(b,c)=1$, then $(a,bc)=(a,b)(a,c)$.
110408
Solving for $A$ in $Ax = b$
88055
Use induction to prove the following: $1! + 2! + .... + n! \le (n + 1)!$
20878
If $(a,b)=1$ then prove $(a+b, ab)=1$.
153053
Find numbers $a, b, c$ given that $a+b+c=12$, $a^2+b^2+c^2=50$, and $a^3+b^3+c^3=168$
12954
Prove if $ac>bc$ and $c>0$, then $a>b$
17491
Proof by Induction: Solving $1+3+5+\cdots+(2n-1)$
92543
Regular expressions: Show that A*B is the solution of X = AX + B
97667
If $a<b$, $c<d$ then $a+c<b+d$?
24856
Proving sup(A + B) = sup A + sup B
56624
Prove that $0!+1! + 2! + 3! + ..... + n!$ $\neq$ $p^\text{r}$, where $n \geqslant 3$ and $n$, $p$ and $r$ are three integers
115719
Find the possible values of |A + B + C |
140290
Solving $AB - BA = C$
86935
Finding all the numbers that fit $x! + y! = z!$