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The content of G. Spencer-Brown's Laws of Form (1969) was almost entirely anticipated, almost exactly the same, by Charles Sanders Peirce's existential graphs in the 1880s. Is there anything that C.S. Peirce didn't invent before everyone else?
Non-monic arrows are those that destroy information that was present in the domain. Non-epic arrows are those that introduce worthless non-information into the codomain.
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