As the title says, I'm wondering if "non-linear" is an acceptable spelling of the word "nonlinear."
A bit of research on this site turns up Is the use of a hyphen between "non" and an adjective strictly necessary?, in which Monica Cellio commented that some of these "non"-prefixed words have entered the language in unhyphenated form. This is the way I'm used to seeing "nonlinear." But other people I work with spell it with the hyphen, "non-linear." Is that valid, or should I point it out as a correction? (This is in a scientific paper going to publication; I wouldn't care in a less formal context)
More generally, what reference(s) would I look at to answer questions like this in the future, about whether a particular compound can/should be spelled with or without a hyphen?