differentiable rsubmx/lsubmx lemmas + derive_sqrt - #1801
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There is certainly more theory to better develop but we'll be coming back to it soon so that is good enough for me now.
t6s
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I suggest changing the statements of differentiable_?submx and letting users combine it with other functions explicitly by differentiable_comp.
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Motivation for this change
When deriving differential equations using lsubmx/rsubmx, we need proofs of their differentiability.
This PR also contains a lemma making use of the "is_derive1_sqrt" lemma to simply derive square roots.
Checklist
CHANGELOG_UNRELEASED.mdReference: How to document
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all compile are preferentially merged into master.
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