GitHub/gf-core
1
0
Fork 1
mirror of https://github.com/GrammaticalFramework/gf-core.git synced 2026-05-10 19:52:50 -06:00
Code Issues Packages Projects Releases Wiki Activity

changed names of resource-1.3; added a note on homepage on release

Browse Source
This commit is contained in:
aarne
2008-06-25 16:54:35 +00:00
parent 7d721eb16e
commit c5c6d13546
1729 changed files with 113 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
old-examples/systemS/ex2eng.txt Normal file
View File

@@ -0,0 +1,7 @@
Suppose A -> B. We will show that ~ B -> ~ A.
It is enough to assume A -> B, ~ B and show ~ A.
Thus, by rewriting ~ A we may assume A -> B, ~ B and show A -> _|_.
It is enough to assume A, A -> B, ~ B and show _|_.
Then, by Modus ponens, we get A, A -> B, B, ~ B to prove _|_.
In particular we get B, ~ B to prove _|_.
Hence we get _|_ as desired.