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6 ideas

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

11022

Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

11065

The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna]

11023

The logical connectives are 'defined' by their introduction rules [Gentzen]

11213

Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen]

5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names

8447	In 'Etna is higher than Vesuvius' the whole of Etna, including all the lava, can't be the reference [Frege]

5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive

8448	Any object can have many different names, each with a distinct sense [Frege]