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A p with a circumflex, standing for a derivative times minus i ℏ.
Also known as: Momentum operator, p hat, Quantum momentum
The momentum operator is minus i ℏ times the spatial derivative, which is why momentum and position cannot both be sharp: their operators do not commute. The whole uncertainty principle follows from that one commutation relation.
Denotes the momentum operator, equal to −iℏ times the gradient in the position representation.
Contexts: Laboratory
Fails to commute with the position operator, and the value of that commutator is what fixes the uncertainty relation.
Contexts: Laboratory
A lowercase letter p with a small inverted-V accent set directly above it.