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Nicholas Kong

Confused on Little Oh

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I was reading the Little Oh notation in a textbook. Apparently it has two meanings:

1) f(x) is Big-Oh (gx)  which means f(x) <= g(x)

2) f(x) is NOT Big-Theta g(x)^4. (This definition confused me a lot.) 


In my own words this would mean: f(x) <= g(x). Since Big Theta is Big Oh and Big Omega combined. f(x) is NOT <= g(x)^4 would mean f(x) is > g(x)^4 and f(x) is NOT >= g(x)^4 which mean f(x) is < g(x) ^ 4. Based on what I said, wouldn't the second definition actually mean f(x) is Big Theta g(x)^4?


Please correct me if I'm wrong. sleep.png 

Edited by warnexus

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Your question is impossible for me to comprehend.  Little O has a very precise meaning.


The key difference between Big O and Little O is that there's some notion of bounds tightness in Big O that is not necessary for Little O.

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