[isabelle-dev] NEWS (constant ii)

2017-02-28 Thread Lawrence Paulson
* Renamed ii to imaginary_unit in order to free up ii as a variable name. 
The syntax \ remains available.
INCOMPATIBILITY.

To my surprise, there are thousands of occurrences of ii throughout the library 
than the AFP. The overwhelming majority of these have nothing to do with the 
complex numbers. Therefore it is highly likely that I have overlooked a few 
that are. But anyway, the repository builds.

Larry

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Re: [isabelle-dev] The Great Picard Theorem

2017-02-28 Thread Manuel Eberl
I'm not an expert in complex analysis either, but do remember that it
was briefly mentioned ā€“ but not proved ā€“ in my introductory lecture on
Complex Analysis when I was an undergratuate.

My intuition tells me that this is a very beautiful result, but not one
that you need a lot, but I could be wrong about this.

I could perhaps ask around a bit.

I for one am quite open to the idea of moving more material from the
distribution to the AFP, especially from HOL-Analysis. Picard's theorem
sounds like a reasonable candidate for that, but in general, I also have
no idea where to draw the line.

Cheers,

Manuel


On 22/02/17 17:46, Lawrence Paulson wrote:
> I have just added this to the Analysis directory, making its inevitable 
> refactoring more necessary.
> 
> Arguably it should be an AFP entry. Unfortunately, Iā€™m not sufficiently 
> expert in complex analysis to say whether it is core material or not. It 
> looks like a fundamental result to me.
> 
> We should probably resolve the question of Analysis before the next release. 
> How do we decide which things go into Complex_Main versus Analysis (which 
> could be split into basic/advanced) and the AFP?
> 
> Larry
> 
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