In mathematics, a delta operator is a shift-equivariant linear operator Q : K [ x ] ⟶ K [ x ] {\displaystyle Q\colon \mathbb {K} [x]\longrightarrow \mathbb {K} [x]} on the vector space of polynomials in a variable x {\displaystyle x} over a field K {\displaystyle \mathbb {K} } that reduces degrees by one. To say that Q {\displaystyle Q} is shift-equivariant means that if g ( x ) = f ( x + a ) {\displaystyle g(x)=f(x+a)} , then ( Q g ) ( x ) = ( Q f ) ( x + a ) .
In mathematics, a delta operator is a shift-equivariant linear operator Q : K [ x ] ⟶ K [ x ] {\displaystyle Q\colon \mathbb {K} [x]\longrightarrow \mathbb {K} [x]} on the vector space of polynomials in a variable x {\displaystyle x} over a field K {\displaystyle \mathbb {K} } that reduces degrees by one. To say that Q {\displaystyle Q} is shift-equivariant means that if g ( x ) = f ( x + a ) {\displaystyle g(x)=f(x+a)} , then ( Q g ) ( x ) = ( Q f ) ( x + a ) .
Source: Wikipedia "Delta operator" · CC BY-SA 4.0
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