Not sure if there are infinitely many ways to factorise 12 in the integers ;)

I can't remember the general definition of a prime numer, but I think it may be

a is prime => if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

EDIT: Yeah, if a is prime and a = b * c then b or c is a unit (invertible element)?

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### #3Paradigm Shifter

Posted 06 December 2012 - 05:12 PM

Not sure if there are infinitely many ways to factorise 12 in the integers ;)

I can't remember the general definition of a prime numer, but I think it may be

a is prime => if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

I can't remember the general definition of a prime numer, but I think it may be

a is prime => if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

### #2Paradigm Shifter

Posted 06 December 2012 - 05:12 PM

Not sure if there are infinitely many ways to factorise 12 in the integers ;)

I can't remember the general definition of a prime numer, but I think it may be

a is prime => if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

I can't remember the general definition of a prime numer, but I think it may be

a is prime => if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

### #1Paradigm Shifter

Posted 06 December 2012 - 05:11 PM

Not sure if there are infinitely many ways to factorise 12 in the integers ;)

I can't remember the general definition but I think it may be

if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).

I can't remember the general definition but I think it may be

if a divides b*c then a = b or a = c

Otherwise, something to do with units (which are invertible elements with respect to multiplication, so those are +1 and -1 for the integers).