Are there any reputable proofreading services out there for texts with mathematical content? I may need such a service soon.
My native language is not English and, even if it were, I would want the basic English of the whole work read through, to make sure everything is top notch English-wise.
Understandably, I hesitate to submit my work to a regular proofreader because of all the formulas throughout the work. It's important that the proofreader should be able, at least approximately, to understand the work and be able to "read" the formulas in context of the surrounding English.
All I require is some basic knowledge of multivariate calculus and probability theory. Basically just what every university student goes through. Nothing too advanced.
Are there any services out there that can provide what I need?
A quick google search revealed this site.
Rather than go with a professional service, I'd suggest hiring a student. You can probably contact the math department office at any major university in an English-speaking country, and I suspect they will pass on the offer to their undergraduate and graduate students. Just be clear about the size of the job and have an idea how much you're willing to pay.