# Category Archives: Spencer Brown

## Logical Graphs, Truth Tables, Venn Diagrams • 9

In November 1619, I had a dream involving the Seventh Ode of Ausonius, which begins Quod vitae sectabor iter [“What road in life shall I follow”]. René Descartes • Experimenta Re: Laws of Form • Lyle Anderson LA: As I … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 8

Re: Laws of Form • John Mingers • Lyle Anderson Re: Logical Graphs, Truth Tables, Venn Diagrams • (2) • (3) Looking to the day we can make our ascent to logical graphs with increasing numbers of variables, I’d like to … Continue reading

## Animated Logical Graphs • 76

Re: Richard J. Lipton • The Art Of Math Re: Animated Logical Graphs • (30) • (45) • (57) • (58) • (59) • (60) • (61) • (62) • (63) • (64) • (65) • (66) • (69) • … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 7

Re: Logical Graphs, Truth Tables, Venn Diagrams • 6 Re: Amphecks On the subject of Peirce’s ampheck operators, see the earlier discussion of their duality under entitative and existential interpretations. Animated Logical Graphs • 74 The ampheck operators are dual … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 6

Re: Laws of Form • John Mingers • Lyle Anderson Dear John, Lyle, See:  Ampheck Peirce discovered this about 1880 but did not publish it, leaving it to be named after Sheffer at a much later date.  In one discussion … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 5

Re: Laws of Form • Lyle Anderson Re: Anderson, Lyle A. III (1981), “Systematic Analysis of Algorithms”, Open Access Master’s Theses, Paper 1167, (1) (2). Thanks, Lyle, your Chapter 4, “Dealing With Conditional Statements”, provides a detailed treatment of algorithmic … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 4

All we are saying is give Peirce a chance Re: Laws of Form • John Mingers • Lyle Anderson Dear John, Lyle, I’ve seen too many ways of interpreting and implementing If‑Then‑Else clauses to know what any one person or … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 3

Re: Laws of Form • John Mingers • Lyle Anderson Dear John, Lyle, There is nothing simple about the interpretation of If-Then-Else constructions in ordinary language as they combine the equivocation between formal and material implication at the outset with … Continue reading

## Logical Graphs, Truth Tables, Venn Diagrams • 2

Re: Laws of Form • John Mingers JM: Most of the recent discussion is about two-variable logic forms where there is a logical relation between two logical variables.  I want to bring up the subject of three-variable logic which I … Continue reading

## Differential Logic • Comment 5

Re: Peirce List • John Sowa : “Modal Logic Is An Immense Swamp” Dear John, Best title I’ve read in a long time!  But the really immense swamp critter here is the Naturally Evolved Organon known as ornery natural language which … Continue reading