I am trying to write a computer program that involves finding 2 very large numbers (several thousand digits) and dividing them to get a reasonable sized number. the first number is a value of the gamma function, which can be defined as a product and thus easy to reduce with logs (find the sum of the log of each term). hoewever the second number is a value of the incomplete gamma function, which AKAIK can only be defined as a sum. clearly, if I just log each term and sum them, id get the log of the product and thus, no dice. However, if I could find some transform for each term, that when summed would equal the log of the total sum, my problems would be solved. Has anyone heard of anything like this?