mathjs

This was actually the second fix I had in mind, after the author mentioned that they would like mathjs to have complete browser support (and therefore couldn't use the `vm` module from Node.js): >If, anyway, you want to make math.eval resistant against arbitrary code execution, I think it would be best to have a whitelist of methods and constructs (i.e. you parse the code that is meant to be evaluated and ensure that every construct is allowed). I analyze JS malware in my free time (see [box-js](https://github.com/CapacitorSet/box-js)), and I found that it is virtually impossible to blacklist functions. For instance, if the parser forbids `[].map.constructor`, I could very well use `[].map["constructor"]`; and if you blacklist the word "constructor", I could use `[].map["rotcurtsnoc".split("").reverse().join("")]`, and so on, there's an i

I was bored so I found a bunch more: https://github.com/josdejong/mathjs/issues/821

As it turns out, Math.js doesn't support arbitrary precision calculations with complex numbers. This is because it is using libraries complex-js [1] and bignumber.js [2], which in turn also don't support arbitrary precision calculations with complex numbers. This situation will improve in the future. See the Math.js issue [3]. [1] https://github.com/patrickroberts/complex-js [2] https://github.com/MikeMcl/bignumber.js/ [3] https://github.com/josdejong/mathjs/issues/694

@pachydermic you can use math.parse("abx + c = y") which returns an expression tree. You can perform transformations on this tree. See docs: http://mathjs.org/docs/expressions/expression_trees.html. There is an early implementation of algebraic differentiation (not yet public): https://github.com/josdejong/mathjs/pull/411. Next step is to implement functions simplify and integrate. It all looks very promising.