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Finding the complexity of a recursive function

Posted 5 months ago
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First time user here.

I'm trying to use Wolfram|Alpha to calculate the time complexity of a recursion function. When using the calculator, the results I get don't include terms such as bigO Omega etc.

For this function: https://www.wolframalpha.com/input/?i=g%28n%29%3Dg%28n%2F2%29%2Bn I should get θ(n), but I can't find it.

Your help is much appreciated.

Why do you expect W|A to give a big-O form for the result? (It is not obvious to me that this shouldn't happen, but neither is it obvious that it should.)

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