If A is a set, let Ix be all functions from X into the unit interval /. Note that if/and g are in Ix then so are 1-f and fg. Such a collection of functions is said to have property V. That is, F has property V in case (i) FEIX for some set X, (ii) /G F implies 1-/GP (hi) /, gEF implies fgEF.
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