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## Homework Statement

In my book, the author was explaining the proof of the Uncertainty relation between po

position and momentum.

It simply stated that [x,p]= ih(h is reduced)

But when I tried to verify it I got -ih. I now it would give the same result, but it still won't be good for me to mess up a fundamental concept so early.

## Homework Equations

[tex]\hat{p}[/tex]=-ih d/dx

[tex]\hat{x}[/tex]=[tex]\hat{x}[/tex]

[A,B]=AB-BA

## The Attempt at a Solution

[x,p][tex]\left|\psi[/tex]>=(xp-pa)[tex]\left|\psi[/tex]>=xp[tex]\left|\psi[/tex]>-pa[tex]\left|\psi[/tex]>

It would become this:

-ihx d[tex]\psi[/tex]/dx -ihx-(-ihx d[tex]\psi[/tex]/dx)=

-ihx

Which is not the answer my book gave me.