Math isn't concerned with "practically straight", so it won't make a difference. For example, consider the number 2 and 2.000000000001. To engineers and scien

Math isn't concerned with "practically straight", so it won't make a difference. For example, consider the number 2 and 2.000000000001. To engineers and scientists, these two numbers are basically the same, and there's no practical difference. To a mathematician, the former is an integer, and the latter isn't - you could add as many zeros to the second number as you want, and the difference won't go away, unless you add an infinite number of zeros, at which point it becomes identical to 2.