Logic Notebook 1880-97

74r 1880 Nov. 6

Being unable at present to write a second paper on The Algebra of Logic I make notes for one.

Notes on Previous Paper

On Chapter I §4. I have represented that the properties of the negative were

1st = A-overline = (A fork X)

2nd = A fork A-double-overline

3rd = A-double-overline fork A

In my circular I have shown stated correctly that 2nd= follows from first and incorrectly that 3d=follows from 1st=, which it don't. Very subtle fallacy [drawn?] from long reduction of mood.

Observe 1st= is not balanced

Give table of moods etc.

Then we have