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## Main Question or Discussion Point

know I'm missing something obvious.

for a momentum operator

if I square the -iħ part I get (+1)ħ

but I believe the correct value (as in the kinetic energy of the Hamiltonian) is

-ħ/2m d

how is the value of the term -ħ/2m where the square of -i = +1?

Thanks!

for a momentum operator

**p**= -iħ d/dxif I square the -iħ part I get (+1)ħ

^{2}but I believe the correct value (as in the kinetic energy of the Hamiltonian) is

-ħ/2m d

^{2}/dx^{2}.how is the value of the term -ħ/2m where the square of -i = +1?

Thanks!