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Engineers are professionals that are licensed, mathematicians and physicists are not. No one is harmed if the physicist or mathematician comes with a theorem that is wrong, it is up to the engineer to use their professionally gained insight whether it is practical to use or not.</p>
<p>Also, when I meant death due to incompetence, I meant something like the Tacoma bridge. I’d love to see you bring one example in history where the incompetence of a physicist or mathematician has resulted in such a tragic accident for the general public.</p>