A. MS. notebook
LOGIC (MS 339-1009)
Existential graphs as a system for expressing any assertion with precision is not intended to facilitate but to analyze necessary reasoning, i.e., deduction. The system introduced by means of four basic conventions (here called "principles") and four rules ("rights") of transformation.
Deduction, Graphs existential, Logic (modal see Modality), Lowell Lectures, Reasoning (probable see also Probability)
LOGIC / LOWELL LECTURES 1903