As I recall, this constant originally comes from HOL Light and is used in a couple of proofs.
And it occurs to me that it might be a good way of dealing with HOL Light’s generalisation of summations and limits to sets of natural numbers. As I ported the PNT, I used two other methods of dealing with that problem. At the moment I don’t regard it as heavily used, but I guess it depends on what one is working on at any one time. I would rather have qualified names than completely arbitrary variations of the name. Larry > On 30 Jun 2017, at 15:57, Manuel Eberl <ebe...@in.tum.de> wrote: > > Still, I for one think this is not really worth the trouble of keeping an > entirely separate constant around, especially because "subseq h" does not > make much sense: "h" itself is not a subsequence of anything, "f ∘ h" is a > sub-sequence of "f". > > It would be interesting to know what other users of Complex_Main think about > that. > >
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