267

21

But all this will be made infinitely clearer by studying how a graph once written may be altered without danger of rendering its asserting false.
There are four
Basic Rights of Transfornation.
Right I.
Any evenly enclosed graph may be erased; and under odd enclosures, already written, any graph can be inserted.

Right II.
Any graph precisely like another that is written under no other enclosures than its own, and connected with the same graphs, can be erased.
Any graph can be repeated under the same or any already written additional enclosures, with the same connections.