ΔxΔp >= ħ*πbar
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True ;-) "h bar" =h/(2*pi) so "pi bar"=pi/(2* pi)=1/2 ;-)
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Be careful: in the Dirac eqn., the Feynman slash through notation is used: (gamma)^(mu)* p_(mu)= "p bar" so: (p bar -i m) psi=((gamma)^(mu)* p_(mu) -i m)psi=0. Where (gamma)^(mu) are Dirac matrices. https://en.m.wikipedia.org/wiki/Feynman_slash_notation …
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For small values of pi
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Pi bar=Pi/2Pi.....hbar=h/2Pi ;-)
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Reduced fat pie
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