...if we conceive of an Algebra on which the symbols x, y, z, &c., admit indifferently of the values of 0 and 1, and of these values alone, the laws, the...Difference of interpretation will alone divide them. For this reason, as to that portion of the work which relates to Logic, nothing more is requisite,...

...values 0 and 1, and of these values alone. The laws, the axioms, and the processes, of such an Algebia will be identical in their whole extent with the laws,...of interpretation will alone divide them. Upon this principle the method of the following work is established." ' The reason for the 0, 1, of course, is...