![]() ![]() I've seen it online occasionally with derivatives (usually in physics examples) with (only) the number on the bottom and the meaning to evaluate the derivative at that number, which was easy enough to figure out. ![]() Nothing I've seen in my text or elsewhere seems to explain what this notation actually means. This is from an average value integral step I copied from a PatrickJMT video on average value. While trying to read up a bit on average value using integrals beyond the single example my book has, I run repeatedly into this type of notation:
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