Pre-image sigma-algebra/Infobox

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Pre-image [ilmath]\sigma[/ilmath]-algebra
[math]\{f^{-1}(A')\ \vert\ A'\in\mathcal{A}'\}[/math]

is a [ilmath]\sigma[/ilmath]-algebra on [ilmath]X[/ilmath] given a [ilmath]\sigma[/ilmath]-algebra [ilmath](X',\mathcal{A}')[/ilmath] and a map [ilmath]f:X\rightarrow X'[/ilmath].

(Unknown grade)
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