set S = {{}};
set B = the BinOp of {{}};
take ShefferStr(# {{}}, the BinOp of {{}} #) ; :: thesis: not ShefferStr(# {{}}, the BinOp of {{}} #) is empty
thus not ShefferStr(# {{}}, the BinOp of {{}} #) is empty by STRUCT_0:def 1; :: thesis: verum