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Oh, and back to MathML versus TeX for a moment. TeX is a presentation-only language. It only tells you how something should look; it can't encode meaning. So, TeX can't distinguish between, say $$d(h)$$ (a variable $\,d\,$ times a variable $\,h\,$) and $$d(h)$$ (a function $\,d\,$ acting on an input $\,h\,$). But, MathML can encode this difference in meaning!