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2021 05 27 Meeting

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affeldt-aist edited this page May 27, 2021 · 1 revision

Participants: Cyril, Kazuhiko, Marie, Pierre, Reynald, Tafumi, Zachary

  • PR 311:
    • remove fer, keep patch which is more general
      • have a default argument (point in case of pointed types)
    • specialize fer from patch
    • rename to restrict
    • MK: compatibilty with the notion of restriction to a family?
      • ZS: see family at the end of the PR
    • CC: several notations for each kind of convergence
      • fct_uniformType default topology for function spaces
      • see restricted_uniformType
      • introduce symbol restricted A(*phantom variable*) := U -> V
      • Definition patch (A : pred U) (f g : U -> V) u : restriced A U V := if_expr (asbool (A u)) (g u) (f u).
    • ZS: problem uniform topology does not depend on the domain
  • PR 318:
    • prove that geometric series converge uniformly over Banach Algebra
    • Banach Algebra: complete normed algebra with norm (A * B) <= norm A * norm B
    • CC:
      • open to change how norm is defined (also MK)
      • does 318 use algebra over the complex numbers? over the reals only? real-valued norm over complex?
    • ZS:
      • need real-normed over the complex
      • squeeze theorem only defined over real vector spaces, to generalize
      • there are other such theorems to be generalized
      • need scaling by complex numbers as in 1 - lambda * t
    • CC:
      • squeeze could be extended to complex numbers
    • MK:
    • CC:
      • normed vector spaces with real scalars
      • the value of the norm can be what you like
      • pbm: normed module have the scalar in the same type as the value of the norm that can be R or C
      • solution: introduce an intermediate step to say that the norm is valued in the base field of the base field
        • should wait for HB though
  • PR 180:
    • MK to look at it next week
    • move BigmaxrNonneg to nngnum.v
    • filter_andb to be packported to MathComp
  • PR 380:
    • use get instead of pselect (exists ...)
    • expR instead of exp
    • try to generalize to the complex numbers
  • CC: spectral theories for matrices: https://github.com/math-comp/math-comp/pull/207
  • PR: about lra for MathComp
    • not possible yet because we need support from the Coq side
    • no zify layer, this makes it more difficult
    • CC: one can just unfold the symbols after instantiating with Rstruct and call lra...
  • RA: an example of nsatz usage
  • ST: status of sequences.v?
    • TODO: task force on power series in R
  • release 0.3.8 asap
  • organize meeting by the end of june
    • not too close to ITP (to start on June 29)
    • around June 18?
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