Why is 0 factorial equal to 1? Is there any pure basic mathematical proof?
2959
Prove $0! = 1$ from first principles
106380
What is $n!$ when $n=0$?
115506
What's wrong with this demonstration? (1 = -1)
39514
how do I prove that $1 > 0$ in an ordered field?
29692
Proof verification: elementary Number Theory Proof of $am+bn = 1$
34024
Are +0 and -0 the same?
108873
How would one be able to prove mathematically that $1+1 = 2$?
5679
Why is $2\pi i \neq 0?$
41645
Checking my understanding: $1 - 1 + 1 - 1 + 1 - ... = \frac{1}{2}$
147528
Where's the error in this $2=1$ fake proof?
129151
Why do computers only use 0 and 1?
61673
Could I define 0^0 to be 1?
14150
Zero to the zero power – is $0^0=1$?
19628
What is wrong with this fake proof $e^i = 1$?
122916
Does $[0.9999....]=1$?
155150
Division of Factorials [binomal coefficients are integers]
1444
Prove/Show that Limit is equal to 0.