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Ideas for '', 'The Principles of Mathematics' and 'The Aim and Structure of Physical Theory'

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6 ideas

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

11210

Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]

11212

The sense of a connective comes from primitively obvious rules of inference [Rumfitt]

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

14105

There seem to be eight or nine logical constants [Russell]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

18722

Negations are not just reversals of truth-value, since that can happen without negation [Wittgenstein on Russell]

5. Theory of Logic / E. Structures of Logic / 3. Constants in Logic

14104

Constants are absolutely definite and unambiguous [Russell]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

14114

Variables don't stand alone, but exist as parts of propositional functions [Russell]