Effective immediately. New release of DC Proof 1.0 (dated 2004-11-06) including: 1. Fixed bug that caused overflow condition when opening very long proofs....
Effective Immediately New release of DC Proof 1.0 includes: 1. New Text Size option on View menu. 2. Spaces now inserted around epsilon character for enhanced ...
Effective Immediately New release of DC Proof 1.0 dated 2004-11-20 includes: 1. New Text Size option on View menu now applies not only to proof text on the...
Here's the Integers constructed, and unique, and Add on Integers as a function. I'm now adding a definition of zero and one to show x+0=x and x+(y+1)=(x+y)+1. ...
Effective Immediately New release of DC Proof 1.0 includes: 1. Fixed bug that, in some cases, failed to update a proof or incorrectly returned a parser error...
Effective 2004-12-06 (Apologies for the delayed notice) New relase of DC Proof 1.0 includes 1. Bug fix for Find (F8) command, that sometimes incorrectly ...
... The format of the proof in the first reply to this question was a bit confusing. In the plain text of these postings, it's hard to tell comments from the...
Hi there Thanks very much could any one plz solve this in DC proof now it's important for me to Know the solution now at this moment there exist x (C(x)&E(x))&...
... Is this for a school assignment? I will give you a hint. This can be proven in 11 lines in DC Proof. For the first 4 lines, use the following rules (in...
Effective immediately New Release of DC Proof 1.0 includes: 1. Minor revisions to section on Set Theory in User Reference Guide. 2. Added proof file to...
Further to today's release of DC Proof 1.0, here are the proof files for the Axiom of Choice mentioned in the notice: http://www.dcproof.com/Choice.html (HTML...
Effective immediately New release of DC Proof 1.0 includes: 1. Fixed bug that, in some cases, did not set colours of free variables correctly, i.e. did not...
Effective Immediately New release of DC Proof 1.0, dated 2005-04-24 (See Help/About) Includes corrections to user documentation. Thanks again to Mark Hurd for...
Effective Immediately New release of DC Proof 1.0 (dated 2005-05-17) includes: 1. Fixed minor bug in mouse-click processing. Occassionally, cursor data would...
Effective Immediately New release of DC Proof 1.0, dated 2005-05-22 Includes: 1. Fixed bug in Make HTML File option that would occassionally drop symbols "<"...
Wish list/suggested enhancements/silly ideas, from the point of view of someone who has just started using DC Proof 1) Hot Keys for the most common functions,...
Hi, Thanks for the suggestions. Below, you will find some suggestions to help you achieve at least some of the functionality you are looking for, using the...
Dan Christensen
dchris@...
Jun 8, 2005 8:43 pm
108
Dan, Thanks for the response to my wishlist, will respond to that over the weekend. Haven't quite gotten the hang of DCProof yet, and am stuck on a proof that...
There is a much easier way. See below. Dan Prove: (~A=>~B)=>(B=>A) Suppose... 1 ~A => ~B Premise 2 ~~B => ~~A Contra, 1 3 B => ~~A Rem DNeg, 2 4 B => A Rem...
Hi Dan, The problem with your proof is that it uses Contra, which is effectively the thing being proved. I agree that CASES should work. NB a workaround: if...
Mark Hurd
mhurd@...
Jun 11, 2005 1:58 pm
111
... Dan, thanks, I didn't realize you had a contrapositive rule as one of the primitives, it will certainly help in some circumstances. Anyway, I wasn't really...
... effectively the ... Imply-And to ... Then if ... Have just fixed this bug. Uploading now -- slow line. Here is the proof using Arbitrary Or Not rule the...
Effective Immediately New release of DC Proof 1.0 dated 2005-06-11 includes: 1. Fix to bug in Case Rule that, in some cases, would not recognize valid...
(Reply e-mailed to me from iquine -- my reply to this to follow) ... Gen' button invokes Universal Generalization, etc.<< Understood, but the tool bar still...
... Gen' ... a ... convenient (for ... I forgot to mention that DC Proof makes extensive use of CTRL, ALT and F key sequences, though not for all commands....
Effective Immediately New release of DC Proof 1.0 dated 2005-06-20 includes: 1. Change to Delete All References (F3) that will, in some cases, reduce the...
