It's not a "stub article" though, it's just a paragraph and then a bunch of stuff plagiarised from a maths textbook. I already edit quite a bit on Wikipedia. I

It's not a "stub article" though, it's just a paragraph and then a bunch of stuff plagiarised from a maths textbook. I already edit quite a bit on Wikipedia. I stay away from the maths bits, because it's a little outside my area of expertise - and because it's just things like "it's a function to calculate distance, and here's ten pages of algebra with no explanation" I can't really improve that on Wikipedia.