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isCommon(T) and member(F,T)

It seems to me that these two boolean functions are so basic
that they shall be required in all flavors:

isCommon(T x)  -  interval "x" is common 

member(F e, T x)  - floating-point number "e" is an element of set "x"
       In Kaucher flavor: "e is an element of Set(x)"

  -Dima