Add finance equations

[foundrium]

I was curious if there was any interest in a finance module?

[milroc]

I like this idea, however I'd say it might be more valuable outside of this library as a separate library (finance.js).

Why?

• To prevent the numbers library from getting bloated
• Gives @elaforc greater exposure handling his own library versus being an active committer to numbers.js (something you're already doing and something that with building that library you will have to do).
• Less management for @sjkaliski and @ethanresnick

Why not?

• finance.js will have numbers.js as a dependency.
• the traction that numbers.js has may not transfer over to finance.js until you find the right way to pitch it and post it on HN, etc.
• numbers.js grows away from being able to support finance.js.

[ethanresnick]

I agree with @milroc...at least with the arg names this function has now, it seems to specific for the core, but that's @sjkaliski's call. Maybe it can be renamed to show how it applies more generally?

[sjkaliski]

@elaforc I think Number.js should remain a toolkit on which a finance library could be built on top of. If there are mathematical tools such as asymptotic analysis, expected values, different types of distributions, all of which a financial library could benefit from, then we should build those in here.

I think it'd be sweet to have physics, finance, chemistry, all types of different maths and science libraries built on top of Numbers.js. So it's important that the tools and API's built here are flexible, interact well, and can mesh well with other subjects.