In some area of math there is a capital PI which denotes something which I don't know. Can anyone help? and it's not pi(n)= all primes under n....

That's a product...

 

like sigma ( :lsum: ), only you multiply each number instead of adding

 

:ucpi: x from x=1 to 4 would be

 

 

1*2*3*4

Cool, just like factorials!

Only this isn't dependent on the numbers being integers

Originally posted by fafalone

Only this isn't dependent on the numbers being integers

 

So do you specify the number of decimals places, or...?

what?

well, when you say that the numbers do not necessariliy have to be integers, I assume that you mean they can be any real number. Is this what you mean?

Well they could be any imaginary number too, but then the result would be imaginary. And the range is usually an integer, but you could use 1/2 * 1/3, etc, whereas you could't do that with a factorial.

Originally posted by fafalone

Well they could be any imaginary number too, but then the result would be imaginary. And the range is usually an integer, but you could use 1/2 * 1/3, etc, whereas you could't do that with a factorial.

 

oh..I see, fractions. So does that exclude decimals?

fractions are representations of decimals.

Originally posted by fafalone

fractions are representations of decimals.

 

What about irrational numbers? Like 2^1/2, 3^1/2, etc.?

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