(adsbygoogle = window.adsbygoogle || []).push({}); hbar or hbar/2??

Regarding the uncertainty principle, some books say

(delta p) (delta x) >= hbar

and others say

(delta p) (delta x) >= hbar/2.

Which is right? This matters because I get different results when I

let p x=hbar(or hbar/2), plug in to the expression for energy, and

minimize it to get the ground state energy of the system.

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# Hbar or hbar/2?

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