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PVS

PVS (Prototype Verification System) is a specification language and theorem prover for validating specifications. PVS helps engineers to design coherent specifications, and to predict the behaviour of systems satisfying the specifications — before implementing them. PVS provides interactive assistance to prove theorems that validate the specifications/models. PVS has been used by OPG to certify nuclear reactors, by NASA for space/avionic systems, and in a large number of other mission critical applications. PVS is both a language and an inference system. The language is a typed higher order logic, featuring undecidable type checking. You cannot write code (such as Java, Ruby or Haskell). You can only write mathematics. It thus forces one to write specifications of systems (i.e. what systems do free of implementation detail) and not how they do it. Furthermore, PVS can so some automatic syntax, typing and other checks that helps ensure that specifications are meaningful. PVS can then be used to validate the specifications. PVS was featured in the movie The Martian.

Current Components

Detailed Documentation

Cursor
Motion		 Operation
Move Delete
Amount forward backward forward backward
Characters C-f C-b C-d DEL
Words M-f M-b M-d M-DEL
Lines C-n C-p C-k (to EOL) C-SPC C-a C-w
Sentences M-e M-a M-k C-x DEL
Expressions C-M-f C-M-b C-M-k C-M-DEL
Paragraphs M-} M-{ (no standard bindings for delete cmds)
End/start of line C-e C-a (repeat count goes to following lines)
End/start of buffer M-> M-< (no repeat count)
Cutting and Pasting
C-SPC Mark one end of region
C-w Cut (after you Mark and move to other end)
M-w Copy (after you Mark and move to other end)
C-y Yank (paste) most recently killed (cut or copied); will also use text currently selected in another application.
M-y Next most recently killed (do C-y first, repeat M-y to cycle thru all)
To make cut/copy/paste behave as it does in other apps, do M-x cua-mode, or put 
 (cua-mode)
in your .emacs to enable in every session.
Scrolling and Windows
C-v Scroll down (toward end of buffer)
M-v Scroll up (toward beginning of buffer)
C-M-v Scroll other window down
C-x 1 One window on current buffer
C-x 2 Split window vertically
C-x 3 Split window horizontally
C-x ^ Grow window vertically; prefix is number of lines
Command-related Stuff
ESC ESC ESC Get me out of where I am now
C-u # Prefix numeric arg # (digits with optional "-" sign) to next cmd
C-g Stop a command in progress, or quit out of a partially entered command
Getting help
C-h k Show command documentation; prompts for keystrokes
C-h a "Command apropos"; prompts for regexp and shows all matching commands
C-h c Show command name on message line; prompts for keystrokes
C-h f Describe function; prompts for command or function name, shows documentation in other window
C-h i Info browser; gives access to online documentation for emacs and more
Miscellaneous
C-_ or C-x u Undo/redo (a series of these keeps undoing; after doing something else, C-_ or C-x u will undo the undo's)
C-q Quoted insert; inserts the next character typed, even if it is a control or meta character
M-x shell-strip-ctrl-m RET Flush ^M at end of line
C-z Suspend/iconify emacs (type "%emacs" in invoking shell to get it back)
C-x C-c Exit emacs (asks about unsaved buffers and running programs)
Files and Buffers
C-x C-f Find file (or create if not there); prompts for file name
C-x C-s Save file
C-x C-w Write file; prompts for new name
C-x s Save modified buffers; asks about each
C-x b Select buffer; prompts for buffer name
C-x C-b List buffers; shows in other window
C-x k Kill buffer; prompts for buffer name
Searching/Replacing
C-s Incremental search forward; searches as you type
C-r Incremental search backward
C-M-s Regexp search forward (there are differences in Emacs regexp syntax wrt Perl, etc.)
C-M-r Regexp search backward
M-x replace-string RET String replace from here to end of buffer; prompts for string and replacement
M-x query-replace RET String replace from here to end of buffer, querying for each occurrence
M-x grep RET Prompts for a grep command, shows hits in a buffer
C-x ` Visit next grep hit