1. 10 Jun, 2019 1 commit
  2. 24 May, 2019 1 commit
    • Robbert Krebbers's avatar
      More consistent naming for `auth`. · 597ec42e
      Robbert Krebbers authored
      This MR is a follow up on the renamings performed (implicitly) as part of
      !215. This MR makes the following changes:
      
      - `auth_both_frac_valid` and `auth_both_valid` are now of the same shape
        as `auth_both_frac_validN` and `auth_both_validN`. That is, both are
        now biimplications.
      - The left-to-right  direction of `auth_both_frac_valid` and
        `auth_both_valid` only holds in case the camera is discrete. The
        right-to-left versions for non-discrete cameras are prefixed `_2`, the
        convention that we use throughout the development.
      - Change the direction of lemmas like `auth_frag_valid` and
        `auth_auth_valid` so that it's consistent with the other lemmas. I.e.
        make sure that the ◯ and ● are always on the LHS of the biimplication.
      597ec42e
  3. 23 May, 2019 1 commit
  4. 20 Feb, 2019 1 commit
  5. 29 Oct, 2018 2 commits
    • Jacques-Henri Jourdan's avatar
      wp_pures. · 2950fca6
      Jacques-Henri Jourdan authored
      2950fca6
    • Jacques-Henri Jourdan's avatar
      A specific constructor for injecting values in expressions · 9646293e
      Jacques-Henri Jourdan authored
      We add a specific constructor to the type of expressions for injecting
      values in expressions.
      
      The advantage are :
      - Values can be assumed to be always closed when performing
        substitutions (even though they could contain free variables, but it
        turns out it does not cause any problem in the proofs in
        practice). This means that we no longer need the `Closed` typeclass
        and everything that comes with it (all the reflection-based machinery
        contained in tactics.v is no longer necessary). I have not measured
        anything, but I guess this would have a significant performance
        impact.
      
      - There is only one constructor for values. As a result, the AsVal and
        IntoVal typeclasses are no longer necessary: an expression which is
        a value will always unify with `Val _`, and therefore lemmas can be
        stated using this constructor.
      
      Of course, this means that there are two ways of writing such a thing
      as "The pair of integers 1 and 2": Either by using the value
      constructor applied to the pair represented as a value, or by using
      the expression pair constructor. So we add reduction rules that
      transform reduced pair, injection and closure expressions into values.
      At first, this seems weird, because of the redundancy. But in fact,
      this has some meaning, since the machine migth actually be doing
      something to e.g., allocate the pair or the closure.
      
      These additional steps of computation show up in the proofs, and some
      additional wp_* tactics need to be called.
      9646293e
  6. 04 Oct, 2018 1 commit
  7. 02 May, 2018 1 commit
  8. 25 Apr, 2018 1 commit
  9. 07 Feb, 2018 1 commit
  10. 23 Dec, 2017 1 commit
  11. 04 Dec, 2017 1 commit
  12. 13 Nov, 2017 1 commit
  13. 25 Oct, 2017 2 commits
  14. 25 Sep, 2017 1 commit
  15. 17 Sep, 2017 1 commit
  16. 09 Sep, 2017 1 commit
  17. 24 Mar, 2017 1 commit
  18. 27 Jan, 2017 1 commit
  19. 09 Jan, 2017 1 commit
  20. 06 Jan, 2017 1 commit
  21. 05 Jan, 2017 1 commit
  22. 03 Jan, 2017 1 commit
  23. 09 Dec, 2016 3 commits
  24. 08 Dec, 2016 1 commit
  25. 06 Dec, 2016 2 commits
  26. 22 Nov, 2016 1 commit
  27. 17 Nov, 2016 1 commit
  28. 03 Nov, 2016 1 commit
    • Robbert Krebbers's avatar
      Use symbol ∗ for separating conjunction. · cc31476d
      Robbert Krebbers authored
      The old choice for ★ was a arbitrary: the precedence of the ASCII asterisk *
      was fixed at a wrong level in Coq, so we had to pick another symbol. The ★ was
      a random choice from a unicode chart.
      
      The new symbol ∗ (as proposed by David Swasey) corresponds better to
      conventional practise and matches the symbol we use on paper.
      cc31476d
  29. 01 Nov, 2016 4 commits
  30. 27 Oct, 2016 2 commits
  31. 25 Oct, 2016 1 commit
    • Robbert Krebbers's avatar
      Generalize update tactics into iMod and iModIntro for modalities. · fc30ca08
      Robbert Krebbers authored
      There are now two proof mode tactics for dealing with modalities:
      
      - `iModIntro` : introduction of a modality
      - `iMod pm_trm as (x1 ... xn) "ipat"` : eliminate a modality
      
      The behavior of these tactics can be controlled by instances of the `IntroModal`
      and `ElimModal` type class. We have declared instances for later, except 0,
      basic updates and fancy updates. The tactic `iMod` is flexible enough that it
      can also eliminate an updates around a weakest pre, and so forth.
      
      The corresponding introduction patterns of these tactics are `!>` and `>`.
      
      These tactics replace the tactics `iUpdIntro`, `iUpd` and `iTimeless`.
      
      Source of backwards incompatability: the introduction pattern `!>` is used for
      introduction of arbitrary modalities. It used to introduce laters by stripping
      of a later of each hypotheses.
      fc30ca08