All of these letters are OPERATORS in MATHEMATICS
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[Q]
4.0.2 Primitives, Verbs and Functional Notation¶
The normal way of writing addition in mathematics and most programming languages uses an operator with infix notation – e.g., addition is written with a plus symbol between the two operands.
In q, we can write addition this way and read it right-to-left as “add 3 to 2.”.
q)2+3
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[∂]
del
noun
MATHEMATICS
an OPERATOR used in vector analysis
What is ∂ called?
The partial derivative is denoted by the symbol ∂ , which replaces the roman letter d used to denote a full derivative.
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[X]
In quantum mechanics, the position OPERATOR is the OPERATOR that corresponds to the position observable of a particle.
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[Z]
The Z-Operator
The Z-transform takes a sequence x[n]
and returns a function X(z)
With this algebraic notation of a shift, together with multiplications and summations this is all we need to characterize /all/ linear translation invariant filters.