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23

be equivalent to burning up the sheet since the sheet only exists, as such, in the minds of the graphist and the interpreter, and that by virtue of the agreement which the writing of the pseudograph destroys.
Notwithstanding this, it is often useful to write the pseudograph in the inner close of a graph.
Take this for example

Washington was a commonplace man
(every assertion is false)

This say 'If Washington was a commonplace man then every assertion is false?'
That is as much as to say that Washington was not a commonplace man.

Now convention No 10 is that fillinf up a close so as to leave no room in it shall be understood as inserting the pseudograph in the close.
Hence in order to deny that Washington was a commonplace