Law of Thought - Plato

Plato

Socrates, in a Platonic dialogue, described three principles derived from introspection.

irst, that nothing can become greater or less, either in number or magnitude, while remaining equal to itself … Secondly, that without addition or subtraction there is no increase or diminution of anything, but only equality … Thirdly, that what was not before cannot be afterwards, without becoming and having become.

Plato, Theaetetus, 155

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