formalism + agda: Consider inverting the "markless" judgment(s) into "marked" judgment(s)

[mirryi]

It might be worth inverting the "markless" judgment to something of a "marked" judgment which would give that an expression has some mark within it.

This would make the current doubly negated statements in Theorem A.3, etc. rather easier to read and understand. That is, instead of, for example, "it is not the case that ě markless", we would have just that "ě marked".