Full Idea
Logical propositions are such as can be known a priori, without study of the actual world.
Gist of Idea
Logic can be known a priori, without study of the actual world
Source
Bertrand Russell (Introduction to Mathematical Philosophy [1919], XVIII)
Book Reference
Russell,Bertrand: 'Introduction to Mathematical Philosophy' [George Allen and Unwin 1975], p.204
A Reaction
This remark constrasts strikingly with Idea 12444, which connects logic to the actual world. Is it therefore a priori synthetic?
Related Idea
Idea 12444 Logic is concerned with the real world just as truly as zoology [Russell]