An excellent introduction to logic (in all possible worlds), September 24, 2002, by Dr. Lee D. Carlson (Baltimore, Maryland USA) [Amazon.com] It is too bad this book is out of print, for the authors ...
Marcos Mazari-Armida, a postdoctoral researcher at CU Boulder, wins 2021 Sacks Prize from the Association of Symbolic Logic A University of Colorado Boulder mathematician has won the Sacks Prize, ...