Again thanks for all the help I've been getting on this wonderful site.

I could not find this property in my textbook, yet it has to be used to solve the following step:

[ ($\displaystyle A_1 \cap A_2 \cap ... \cap A_k$ - B) ] $\displaystyle \cap$ ($\displaystyle A_k$$\displaystyle _+$$\displaystyle _1 $ - B)

Is there a distributive property for the difference of sets that is used to write the following?:

[ ($\displaystyle A_1 \cap A_2 \cap ... \cap A_k$ ) $\displaystyle \cap$ $\displaystyle A_k$$\displaystyle _+$$\displaystyle _1 $] - B