Category Archives: Logical Graphs

The Difference That Makes A Difference That Peirce Makes : 19

Re: Peirce List Discussion • John Sowa Peirce uses the word “formal” in a sense that gives it normative force.  It is this sense in which he defines logic as formal semiotic. But taking “formal” in a normative sense creates difficulties … Continue reading

Posted in C.S. Peirce, Descriptive Science, Formal Languages, Inquiry, Logic, Logic of Relatives, Logical Graphs, Mathematics, Normative Science, Peirce, Pragmatism, Relation Theory, Semiotics, Sign Relations, Triadic Relations | Tagged , , , , , , , , , , , , , , | Leave a comment

Peirce’s 1903 Lowell Lectures • Comment 5

Re: Peirce List Discussion • Gary Fuhrman On the relationship between the classical laws of logic and their easement, relaxation, stay, or violation in the qualities of generality and vagueness, see the quotes and remarks I posted to the Foundations … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | Leave a comment

Peirce’s 1903 Lowell Lectures • Comment 4

Re: Peirce List Discussion • Helmut Raulien George Spencer Brown mentions Charles S. Peirce and also Christine Ladd-Franklin in the chapter notes, appendices, and references of his Laws of Form.  Just scanning very quickly, I find references on pages 90, 111, … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | 1 Comment

Peirce’s 1903 Lowell Lectures • Comment 3

Re: Laws Of Form Discussion Peirce’s use of the “scroll” as a graphical syntax for implication continued to raise many questions at this point in the Peirce List reading.  I think a lot of what bothers people has more to … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | Leave a comment

Peirce’s 1903 Lowell Lectures • Comment 2

How Logic Got Its Blots Re: Laws Of Form Discussion Taking positive implication as a basic construct, as Peirce does in the lectures at hand, one has to find a way to rationalize the introduction of negative concepts, in the … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | Leave a comment

Peirce’s 1903 Lowell Lectures • Comment 1

Re: Peirce List Discussion • Gary Fuhrman One way of saying “not x” or “x is false” is to say “x implies α” where “α” is taken to mean “any proposition whatever”.  This is the hoary old rule of ex … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | Leave a comment

Peirce’s 1903 Lowell Lectures • Preliminaries

Re: Peirce List Discussion • Gary Fuhrman In September the Peirce List began a reading of Peirce’s 1903 Lowell Lectures (“Some Topics of Logic Bearing on Questions Now Vexed”).  I’ve had opportunities for only a few desultory comments from time … Continue reading

Posted in C.S. Peirce, Diagrammatic Reasoning, Graph Theory, Laws of Form, Logic, Logical Graphs, Mathematics, Peirce, Peirce List, Propositional Calculus, Propositional Equation Reasoning Systems, Spencer Brown, Visualization | Tagged , , , , , , , , , , , , | Leave a comment