document.write( "Question 1074058: let X IS NOT EQUAL TO 0.let X approach to X be a bijective mapping, define \r
\n" ); document.write( "\n" ); document.write( "F=(A subset of X : A=f^-1(B) for some B subset of X)
\n" ); document.write( " is F a sigma-algebra over X? if so prove. if not,state and show that which property is not satisfied.
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Algebra.Com's Answer #688777 by ikleyn(52908)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "Makes no sense.\r
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