Domain-specific languages vs. library of functions

This may be subjective, I don't know: I have this problem, which I'm kind of equating to the "what language for this project?" question, since I can't seem to solve it.

I've been commisioned to write a book about a certain domain (let's say a very specific branch of physics) for a very technically savvy community, but who are not programmers. It is a book on this subset of algorithms that they use day in day out.

For this, given my audience, I've been toying with the idea of defining a DSL, instead of making them learn language X, and discuss the algorithms in this light, instead of in a given language or in pseudo-code.

The question is, then: what are some indications that what you need is a DSL rather than a library of functions to be called from a well-established, general-purpose language?

Thanks.

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