19

So much of the system of existential graphs
as I have thus far described I call the alpha
part of the system.

There are certain ways in which graphs
scribed on the sheet of assertion can be
modified without any possibility of changing
a true graph into a false one. Such modifications,
I call permissible transformations.
In particular those which can be proved
by the principles of the alpha part of the system to be
permissible, that is, never to be capable of
changing a true graph into a false one
are called alpha permissible transformations.
The alpha part of the system establishes
three kinds of signs besides the graphs themselves.
The first sign consists in writing scribing two graphs

So much of the system of existential graphs
as I have thus far described I call the alpha
part of the system.

There are certain ways in which graphs
scribed on the sheet of assertion can be
modified without any possibility of changing
a true graph into a false one. Such modifications,
I call permissible transformations.
In particular those which can be proved
by the principles of the alpha part of the system to be
permissible, that is, never to be capable of
changing a true graph into a false one
are called alpha permissible transformations.
The alpha part of the system establishes
three signs besides the graphs themselves.
The first sign consists in scribing two graphs