Tractatus: Intelligible negation is the test of sense of a proposition.
Only propositions with sense should be discussed.
Propositions without intelligible negation should not be discussed.
Picture theory: both the proposition and its negation are supposed to describe a possibility, otherwise the status of a proposition is other than that of a significant.
The difference between incomplete and insignificant propositions. Is it possible to negate possibilities which cannot be conceived, but which are not insignificant when negated?
The relational, as opposed to the substantive content of propositions, and the role of negative propositions within value networks of meaning.
Multiple negation? Comparative negation: coffee without milk vs coffee without cream.
Circular reasoning: the picture is not meaningful because I am unable to picture it.
Picture as content. What is content? It cannot be picture because content is what the picture is of, not the picture itself.
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