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2021-04-13 15:35:54 <ski> however, for terminating computations, it does get closer to the result. often one would prove a computation is terminating, by introducing some kind of "size" measure, and show that it decreases (discretely) in each step (towards zero)
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2021-04-13 15:36:34 <ski> (e.g. in some cases, one might operate on trees, and get wider, but shallower, trees, in each step)
2021-04-13 15:37:29 <fiedlr> Yeah I know what you mean... I meant more like when it is used with "expansion" in the same text. But I couldn't think of a better alternative :-( I guess I'll stick to that.
2021-04-13 15:37:47 <fiedlr> Especially when the "size" measure is not clearly stated.
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2021-04-13 15:39:37 <dolio> Well, in the case of β, there is not really a canonical choice of 'expansion' either, so it is ill behaved in that way, too.
2021-04-13 15:39:46 <dolio> Unlike η, where the term is actually used.
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2021-04-13 15:41:58 <ski> η-expansion for sum types would also be more open-ended, iirc
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2021-04-13 15:42:27 <dolio> Which is also not done.
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2021-04-13 15:43:00 <fiedlr> Of course, in general it is ill-defined. That's why I talked about a particular computation branch.
2021-04-13 15:43:02 <ski> mm. i suppose η-long form doesn't use that (?)
2021-04-13 15:43:43 ski . o O ( normalization-by-evaluation, reflection & reification via delimited continuations )
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2021-04-13 16:51:06 <kw> Is there a conventional way of naming traversals? Like how folks add 'L' to the names of lenses?
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2021-04-13 16:56:20 <tapas> not really kw. I tend to name those similarly to any other traverse-based functionality
2021-04-13 16:57:26 <kw> My problem is that the obvious names are already taken by less obvious functions. I'm thinking of tacking an 'A' or 'T' to the end.
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