Question: code class = asciimath > Show that a class A of subsets of Omega is a field if ( i ) A , BinA

code class="asciimath">Show that a class A of subsets of \Omega is a field if (i) A,BinA=>A\cup BinA, (ii) BsubA=>A-BinA, (iii)\Omega inA. The class A is a \sigma-field if in addition (iv) A_(1)inA,(i=1,2,dots)=>A=\cup u_(1)^(\infty )A_(i)inA.
code class = "asciimath" > Show that a class A of

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