The impossibility of X does not render discourse about X pointless, as philosophy of mathematics demonstrates through productive engagement with impossible objects like contradictory sets.

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Contradictory sets(as a specific example of an impossible object): In mathematics, a collection of things that contains a logical contradiction—like a set that is somehow both a member of itself and not a member of itself at the same time.
Philosophy of mathematics(the field Wittgenstein is working in): The area of philosophy that asks fundamental questions about math itself: What are numbers? Do they exist in the world, or only in our minds? Are mathematical truths discovered or invented?
Pointless(as describing speculation that would have no real benefit): Without purpose, meaning, or practical value; serving no useful function.
discourse(The reflexive level speakers and hearers shift to when a speech act fails to receive uptake in ordinary communication): Processes of argumentation and dialogue in which the validity claims implicit in speech acts are tested for their rational justifiability as true, correct, or authentic

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