The general form of truth-function is: [, , N()].
This is the general form of proposition.
6.1 (3) The propositions of logic are tautologies.
6.2 (4) Mathematics is a logical method.
The propositions of mathematics are equations, and therefore pseudo-propositions.
6.3 (7) Logical research means the investigation of all regularity. And outside logic all is accident.
6.4 (5) All propositions are of equal value.
6.5 (4) For an answer which cannot be expressed the question too cannot be expressed.
The riddle does not exist.
If a question can be put at all, then it can also be answered.