*/
private MembershipFunction fclTreeFuzzifyTermSigmoidal(Tree tree) {
if( debug ) Gpr.debug("Tree: " + tree.toStringTree());
Value gain = new Value(tree.getChild(0), this);
Value t0 = new Value(tree.getChild(1), this);
MembershipFunction membershipFunction = new MembershipFunctionSigmoidal(gain, t0);
return membershipFunction;
}