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# Questions

0
votes
2
answers
224
views

### Summing a function using modulus. [closed]

nov 28 11 at 16:32 GarouDan 314

1
-1
votes
0
answers
477
views

### How to find the sum? [closed]

nov 15 11 at 1:27 GarouDan 314

0
votes
1
answer
475
views

### Matrices. $XX^t=A$. $X=?$

nov 7 11 at 7:03 Brendan McKay 9,11111333

0
votes
0
answers
367
views

### How to prove? Prime numbers. [closed]

nov 2 11 at 15:42 GarouDan 314

0
votes
3
answers
672
views

### How to isolate $f(x)$ in $f(x+a)=f(x)+a\times g(x)$?

nov 2 11 at 2:54 Barry Cipra 3,2691818

0
votes
0
answers
396
views

### Odd perfect numbers. What’s the best progess we now about them? [closed]

oct 31 11 at 14:08 GarouDan 314