explain the basic concepts and principles in
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explain the basic concepts and principles in
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I'm spanish, and language here can be an issue, so bear with me.
This is an answer centered in metaphysics.
A concept does not state how things are, that would be a judgement. For example: "tree" or "life" do not state that "there is a tree" or that "life is hard", or whatever.
A concept is not true or false, but it may be able to refer something of the imagination, meaning that somebody invented, like a unicorn, or it may refer something found in front of us, something that we induce to know, like a tree or life (the hard part is to remember what of "there" remains after our own mind games, that's why it is said that reality is analogous).
A principle is a necessary judgement, from the perspective of knowledge. Or, from a realist perspective, a necessary way reality is, a law of sorts (strictly speaking, it would be a true "axiom", not postulated). Necessity is here used strictly, as opposed to contingency.
A postulate is not a principle because it can be negated, a principle cannot be negated. For example the principle of non-contradiction: "anything cannot be how it is and some other way, in the exact same sense of that thing, simultaneously". Meaning for example: if the glass if half empty, it is not half full in the exact same sense, that is, what is empty is not full, etc. though we may like to play mind games.
Negating a principle is saying nothing, or saying something that doesn't mean anything. "Meaning", and any meaning take their sense from the principle itself.
A principle has to be evident, meaning it can't refer "back" to any antecedent, because it is a principle, It has nothing that goes first, IT goes first. If given enough attention, one has to end up saying something like "Of course, it is impossible for it to be any other way".
Strictly speaking, if a principle is not material, there can be only one principle, because without matter, having to identical things is having only that one same thing: there is no crystal to differentiate two and (analogously speaking) the same glasses, for example.