On Mon, 11 Jan 2016, Manuel Eberl wrote:
I also noticed the ring_gcd instance for polynomials. Finalising the
changes to the GCD class hierarchy and updating the AFP entries that
rely on half-finished versions of this change (such as Echelon_Form) is
something that I should probably take care of soon, but definitely not
before the 2016 release – hopefully before the 2017 one.
Note that 2016 is what could be called an "Isabelle leap-year". With a
release near the start, there needs to be a second one near the end. The
distance between releases is constant at approx. 8-10 months.
At some point we've tried to target exactly 12 months, but that resulted
in 25 months, and a commitment to the strict 8-10 months rule afterwards.
Interestingly, the Coq guys are trying for years to target 12 months as
well, but the 8.5 release is already much longer in the pipeline. (More
than 3 years?)
Makarius
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