# 4

### Facsimile

### Transcription

4

of theory. I will only say that in formulating that

rule, I considered that of the six fundamental permissible operations,

two are non-reversible, namely erasure and insertion. ~~Where~~ That is where ~~there can~~ either of

these can be performed the reverse operation cannot be performed. I further considered that three of the six fundamental permissible

operations complicate the graph, while the other

three simplify it. Namely, insertion, iteration,

and the ~~placing of~~ ~~marking~~ introduction of a double cut, complicate

the graph, while erasure, deiteration, and the

removal of a double cut simplify it. It is

necessary for the purpose to modify the

non-reversible operations so as to render

them reversible; and it fortunately happens

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