I am a student who is interested in both mathematics and engineering. I want to pursue a degree in mathematics, but because of its relatively small job prospects, I wish to take some engineering electives. However, I have a strong feeling that, unlike actuarial positions, engineering positions almost always require a specific degree in engineering (or a license or something). So I was wondering if taking engineering electives, but specialize in a particular concentration (e.g. only taking Heat Transfer & Thermodynamics courses as opposed to taking all mechnical engineering core courses), will enhance the chance of getting a job at a company that specilize in Heat Transfer & Thermodynamics. Or do most Heat Transfer & Thermodynamics companys expect you to know broad knowledge in mechanical engineering?