Provided by: prooftree_0.12-1build1_amd64 bug

NAME

       prooftree - proof-tree display for Proof General

SYNOPSIS

       prooftree [Options...]

DESCRIPTION

       Prooftree  visualizes  proof trees during proof development with Proof General.  Currently
       it only works for Coq,  though  adding  support  for  other  proof  assistants  should  be
       relatively easy.

       To  start  a  proof-tree  display, hit the Prooftree icon in the Proof General tool-bar or
       select the menu entry Proof-General -> Start/Stop Prooftree or type C-c  C-d  (which  runs
       proof-tree-external-display-toggle).  Inside a proof, this will immediately start a proof-
       tree display for the current proof. Outside a proof, Proof General remembers to start  the
       proof-tree display for the next proof.

       Under  normal  circumstances Prooftree is started by Proof General as an Emacs subprocess.
       The user interacts with Prooftree only through the graphical user interface. A substantial
       part  of  the  proof-tree visualization task is done by Proof General.  Therefore not only
       the Prooftree command line arguments but also other aspects can only be configured  inside
       Proof General, see Proof General Customization below.

OPTIONS

       -help  Print synopsis and exit.

       -config
              Open  the  configuration dialog on startup (if you want to change the configuration
              without starting Proof General).

       -geometry spec
              Sets the X geometry of the main window.  spec is a standard X  geometry  string  in
              the form xposxypos[+xoff[+yoff]].

       -tee file
              Write all input to file (usually for debugging purposes).

       -debug Provide more details on errors.

       -help-dialog
              Open the help dialog on startup. Mainly useful for proofreading the help text.

MAIN PROOF DISPLAY

       Prooftree  opens  one  window for each proof that it is requested to display.  This window
       contains the proof-tree graph and a small display for sequents and proof commands.

   Colors
       The branches in the proof-tree graph are colored  according  to  their  state.   Prooftree
       distinguishes between the following states.

       current (blue by default)
              The  current  branch  is  the branch from the root of the proof tree to the current
              goal.

       unproven (default foreground color)
              A branch is unproven if it contains open proof goals.

       proved incomplete (cyan by default)
              An incompletely proved branch has its proof finished, but some of  the  existential
              variables that have been introduced in this branch are not (yet) instantiated.

       proved partially (dark green by default)
              In  a  partially  proved  branch all existential variables of the branch itself are
              instantiated, but some of those instantiations contain existential  variables  that
              are not (yet) instantiated.

       proved complete (green by default)
              A  branch is proved complete if all its existential variables are instantiated with
              terms that themselves do not contain any existential variables.

       cheated (red by default)
              A cheated branch contains a cheating proof command, such as admit

       The colors as well as many other Prooftree parameters can  be  changed  in  the  Prooftree
       Configuration Dialog (see below).

   Navigation
       When  the  proof  tree  grows large one can navigate by a variety of means. In addition to
       scroll bars and the usual keys one can move the proof tree by dragging with mouse button 1
       pressed. By default, dragging moves the viewport (i.e., the proof tree underneath moves in
       the opposite direction). After setting a negative  value  for  Drag  acceleration  in  the
       Prooftree  Configuration Dialog, dragging will move the proof tree instead (i.e, the proof
       tree moves in the same direction as the mouse).

   Sequent Display
       The sequent display below the proof tree  normally  shows  the  ancestor  sequent  of  the
       current  goal. With a single left mouse click one can display any goal or proof command in
       the sequent display. A single click outside the proof tree will  switch  back  to  default
       behavior.  The  initial  size  of  the  sequent  display  can  be  set  in  the  Prooftree
       Configuration Dialog.  A value of 0 hides the sequent display.

   Tool Tips
       Abbreviated proof commands and sequents are shown in full as  tool  tips  when  the  mouse
       pointer  rests  over  them.  Both,  the  tool  tips for abbreviated proof commands and for
       sequents can be independently switched off in the  Prooftree  Configuration  Dialog.   The
       length at which proof commands are abbreviated can be configured as well.

   Additional Displays
       A  double  click  or  a  shift-click  displays  any goal or proof command in an additional
       window. These additional windows are deleted when the main proof-tree  window  disappears,
       unless their Sticky button is pressed.

   Existential Variables
       Prooftree  keeps  track  of existential variables, whether they have been instantiated and
       whether they depend on some other, not (yet) instantiated existential. It  uses  different
       colors  for  proved  branches  that  contain  non-instantiated  existential  variables and
       branches that only depend on some not instantiated existential.  The list of currently not
       (yet)  instantiated  existential  variables  is appended to proof commands and sequents in
       tool-tips and the other displays.

       The Existential Variable Dialog displays a table with all  existential  variables  of  the
       current  proof and their dependencies. Each line of the table contains a button that marks
       the proof command that introduced this variable (with yellow background, by default)  and,
       if  present, the proof command that instantiated this variable (with orange background, by
       default).

   Main Menu
       The Menu button displays the main menu. The Clone item clones the current proof tree in an
       additional  window.  This  additional window continues to display a snapshot of the cloned
       proof tree, no matter what happens with the original proof.

       The Show current item moves the viewport to the proof tree such  that  the  current  proof
       goal (if there is any) will be visible.

       The Exit item terminates Prooftree and closes all proof-tree displays.

       The  remaining  three items display, respectively, the Prooftree Configuration Dialog, and
       the Help and About windows.

   Context Menu
       A right click displays the Context Menu, which contains additional items.

       The item Undo to point is active over sequent nodes in the proof tree. Then  it  sends  an
       retract  or  undo  request  to Proof General that retracts the scripting buffer up to that
       sequent.

       The items Insert command and Insert subproof are active over proof  commands.  They  sent,
       respectively, the selected proof command or all proof commands in the selected subtree, to
       Proof General, which inserts them at point.

CONFIGURATION

   Prooftree Configuration Dialog
       Changes in the configuration dialog take only effect  when  the  Apply  or  OK  button  is
       pressed.  The  Save button stores the current configuration (as marshaled OCaml record) in
       ~/.prooftree, which will overwrite the built-in default configuration  for  the  following
       Prooftree runs. The Restore button loads and applies the saved configuration.

   Proof General Customization
       The  location  of  the  Prooftree  executable  and  the  command line arguments are in the
       customization group proof-tree.  Prover specific points, such as the  regular  expressions
       for  navigation and cheating commands are in the customization group proof-tree-internals.
       To visit a customization group, type M-x customize-group  followed  by  the  name  of  the
       customization group inside Proof General.

LIMITATIONS

       For  Coq,  proofs  must  be  started with command Proof, which is the recommended practice
       anyway (see Coq problem report 2776).

PREREQUISITES

       This version of Prooftree requires Coq 8.4beta or better and Proof General 4.3pre130327 or
       better.

FILES

       ~/.prooftree
              Saved  Prooftree  configuration.  Is loaded at application start-up for overwriting
              the built-in default configuration. Must contain a  marshaled  OCaml  configuration
              record.

SEE ALSO

       The Prooftree web page, http://askra.de/software/prooftree/

       The Proof General Adapting Manual
              contains  information  about  adapting  Prooftree  for  a  new proof assistant (see
              http://proofgeneral.inf.ed.ac.uk/adaptingman-latest.html).

CREDITS

       Prooftree has been inspired by the proof tree display of PVS.

AUTHOR

       Hendrik Tews <prooftree at askra.de>