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Normalisation in intuitionistic natural deduction

+ +This applet implements the bog-standard version of intuitionistic +natural deduction. If you are familiar with any textbook on proof +theory (e.g. this one), then most things will look very familiar to you. +Note that natural deduction is here implemented in `sequent style'. +
+How to use it?  +If your browser is working correctly, then you will see a window +with two examples (more added if I have time or you suggest one). +When you press on one of the buttons, a new window will pop up. What +follows is a brief explanation of all the features available in this window. +
+Buttons and Keys +
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  • The buttons +        + `fire' beta-redexes (nothing surprising here). +
  • If you use the left mouse button for pressing on those buttons, + then the new proof will appear inside the window. Whereas if you use + the right mouse button, a new window will pop up and + the new proof will be displayed in this window. Use the right mouse + button if you want to compare a proof and its reduct. +
  • The keys Page-up and Page-down zoom in or out of a proof + respectively. +
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+Menu Functions + +
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  • Zoom in and Zoom out work like Page-up and Page-down, + respectively. +
  • Unicode  If this radiobutton is switched on, logic symbols + are displayed in unicode, otherwise in ascii. (This is for the + poor guys who have a browser and/or operating system which cannot handle + unicode.) +
  • Labels  As mentioned earlier the sequents are composed of + two sets of labelled + formulae, not multisets of formulae as in the standard formulation + of sequent calculus. Enabling this radiobutton causes that labels are + drawn. Use this when you are unsure where implicit contractions are. +
  • Compact printing  Usually formulae are weakened only in axiom. + If this radiobutton is switched on (default), then, in order to save space, + formulae are weakened as soon as possible. +
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+Applet should appear in a new window, but you don't have Java enabled in your browser. +

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+ +Last modified: Sat Mar 3 05:16:48 CET 2007 + + +