[isabelle] Using schematic_lemma to avoid boilerplate
I have a case-splitting lemma
lemma caseA: "[| X; Y; C1; ...; Cn |] ==> P"
where X and Y are premises and C1 to Cn are the different cases. The
latter tend to be quite long.
Now, using the lemmas
lemma D_X: "D x ==> X"
lemma D_Y: "D x ==> Y"
I want to lift caseA to use D x:
lemma caseB: "[| D x; C1; ...; Cn |] ==> P".
But I don't want to copy'n'paste the cases, as this a) adds no
information and b) makes it cumbersome to change the original caseA.
Therefore I tried
lemmas caseB = caseA[OF D_X D_Y]
But this leaves me "[| D x1; D x2; ... " which is not intended.
Then I found that I can use schematic_lemma:
assumes "D x"
shows "PROP ?C"
using D_X[OF `D x`] D_Y[OF `D Y`]
by (fact caseA)
I can figure this might be seen as abuse of the schematic_ construct. So
my question is: Is this intended to work? Or is this only working by
accident? Is there a better way of doing it (without having to spell out
all the cases)?
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