Top positive review
A mind opener
Reviewed in the United States on August 19, 2020
A local (accredited) university allows a course in Propositional Logic to replace algebra. There is even Propositional Calculus. I find algebra a lot simpler.
Well, this critter is symbolic logic (Mathematical logic) is not the same but close enough. It is more English orientated however eventually moves into symbol tables. But still a toughie. Lewis Carroll gives a warning at the front of the book to not try to dive into the middle of the book or peak at the last chapter or you will be confused and toss out your opportunity to learn symbolic logic. Each chapter (I found page) builds on the previous.
I am only a few chapters in at this time however I see the world of communication in a new light.
A person with no concept of electricity sees a switch and knows it is on and off and that is it. Others will look at the switch and see the end product of how the electricity operates form the physical wires to the A.C. concept. They may even follow the power to the source. Then the source to the materials. Then the materials to physics. Then to the quantum. Eventually from the quantum to us and back to turning on the switch.
All of that is simpler than this book on logic gets around to. It is someone’s idea of logic.
Amazingly, the mathematician Lewis Carroll could write about something so deep over a century ago and still be spot on. Of course, he does mention cities that use gas for lighting.
So, enjoy, dig in, discuss with friends, and be thankful for this opportunity to expand your mind.
What Carroll did not know:
The less-than sign plus the equals sign (<=) is used for an approximation of the less-than-or-equal-to sign (≤).
ASCII does not have a less-than-or-equal-to sign.
But Unicode defines it at code point U+2264.
In BASIC, Lisp-family languages, and C-family languages (including Java and C++), operator <= means "less than or equal to".