03.20
If P implies Q, and Q implies R, then P implies R
03.19
No proposition can be simultaneously true and false
03.18
That which is asserted without evidence may be dismissed without evidence
03.17
The map is not the territory; the name is not the thing named
03.16
All models are wrong; some models are useful
03.15
From a contradiction, anything follows — ex falso quodlibet
03.14
A system cannot demonstrate its own consistency from within