Formula:122

Digital Library of Mathematical Functions ID 1.5.E28

${\displaystyle{\displaystyle f^{*}(x,y)=\begin{cases}f(x,y),&\mbox{if $(x,y)\in D$},\\ 0,&\mbox{if $(x,y)\in R\setminus D$.}\end{cases}}}$

Symbols List

• ${\displaystyle{\displaystyle\in}}$:
• ${\displaystyle{\displaystyle(\NVar{a},\NVar{b})}}$:
• ${\displaystyle{\displaystyle\setminus}}$:
• ${\displaystyle{\displaystyle R}}$: closed rectangle
• ${\displaystyle{\displaystyle D}}$: region contained in R
 

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