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