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mLine 57:
Line 57: + − * [[Bertrand Russell]] and Albert N Whitehead, "Principia Mathematica"
I'm willing to bet money that no one here can even attempt to read what's in Principia Mathematica, so I've removed it
== Recommended reading ==
== Recommended reading ==
* Patrick Hurley, "A Concise Introduction to Logic, 12th Edition"
* [[Aristotle]], "Organon"
* [[Aristotle]], "Organon"
* [[Gottlob Frege]], "Begriffsschrift" and "The Foundations of Arithmetic"
* [[Gottlob Frege]], "Begriffsschrift" and "The Foundations of Arithmetic"
* Bas van Fraassen and J C Beall, "Possibility and Paradox"
* Bas van Fraassen and J C Beall, "Possibility and Paradox"
* Geoffrey Hunter, "Metalogic"
* Geoffrey Hunter, "Metalogic"