ProofGrid.know_at: law of minebender-game@1.0.0.0
Import: import minebender-game@1.0.0.0/proof_grid.bend as ProofGrid
Lines 86-96 of minebender-game@1.0.0.0/proof_grid.bend: https://jend.leeeet.dev/read.txt?path=minebender-game@1.0.0.0/proof_grid.bend&start_line=86&end_line=96

import Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/board.bend as B
import minebender-game@1.0.0.0/game.bend as G
import minebender-game@1.0.0.0/LAWS.bend as L

# On the board, the knowledge shows what seen_at says.
law know_at:
  for +w: Nat
  for +h: Nat
  for +layout: T.Grid(Bool)
  for +shown: T.Grid(Bool)
  for +x: Nat
  for +y: Nat
  for +on: {B.on_board(w, h, T.Pos{x, y}) == True{} : Bool}
  {L.at(T.Seen, T.Hidden{}, G.know_rows(w, h, layout, shown, List.range(h)), T.Pos{x, y})
    == G.seen_at(w, h, layout, shown, T.Pos{x, y}) : T.Seen}

Uses (22):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.get
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.range
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe.default
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_lt
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/LAWS.bend&name=at
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=on_board
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/game.bend&name=know_row
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/game.bend&name=know_rows
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/game.bend&name=seen_at
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_base.bend&name=and_true_l
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_base.bend&name=and_true_r
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_base.bend&name=range_get
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_grid.bend&name=know_row_get
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_grid.bend&name=know_rows_get
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Grid
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Pos
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Seen