[isabelle-dev] NEWS

[Tobias Nipkow]

On 10/09/2015 12:19, Dmitriy Traytel wrote:
> Hi Florian,
>
> while I very much welcome the simplified printing rules and your effort of
> unifying case_prod/split, I am not sure if adding a third alternative name is
> the way to go. The situation reminds me of the one depicted in [1].
>
> Clearly, case_prod is the "right" name from the perspective of the (co)datatype
> package.

Yes, we should return to that name in the end.

Tobias

> Dmitriy
>
> [1] https://xkcd.com/927/
>
> On 10.09.2015 12:02, Florian Haftmann wrote:
>> * Combinator to represent case distinction on products is named
>> "uncurry", with "split" and "prod_case" retained as input abbreviations.
>>
>> Partially applied occurences of "uncurry" with eta-contracted body
>> terms are not printed with special syntax, to provide a compact
>> notation and getting rid of a special-case print translation.
>>
>> Hence, the "uncurry"-expressions are printed the following way:
>>
>> a) fully applied "uncurry f p": explicit case-expression;
>>
>> b) partially applied with explicit double lambda abstraction in
>> the body term "uncurry (%a b. t [a, b])": explicit paired abstraction;
>>
>> c) partially applied with eta-contracted body term "uncurry f":
>> no special syntax, plain "uncurry" combinator.
>> This aims for maximum readability in a given subterm.
>> INCOMPATIBILITY.
>>
>> This refers to e6b1236f9b3d.
>>
>> This schema emerged after some experimentation and seems to be a
>> convenient compromise. The longer perspective is to overcome the
>> case_prod/split schism eventually and consolidate theorem names accordingly.
>>
>> The next step after this initial cleanup is to tackle the »let (a, b) =
>> … in …« issue.
>>
>> 	Florian
>>
>>
>>
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>
>
>
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