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In mathematics an operand is the object of a mathematical operation.



In functional analysis, physics and quantum mechanics, functions and arguments for clarity are often called operators and operands. An operand is the object or quantity that is operated on.


Example 1

You write the differential operator with the letter D as

 ,   ,   ,  ... etc.

which stands for "take the derivative of...", so you get Dx = 1.


Example 2

The Laplace operator of a function describes for three dimensions


Example 3

The Hamilton operator H is used in the Schrödinger equation


Example 4

The energy operator acts on the wave function ψ (r, t) and is written as


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