Dear dog, trying to parse what you write is problematic. You need to write clearer. You pack double negatives into statements that don't require them. Why would you write 'If there is no such thing as something' - all that is amounts to 'if there is nothing'
So the first statement becomes 'If there is nothing that cannot be explained by something external'
This is not the same as saying there is nothing.
So the second statement 'there is nothing that can be explained by something external' not only doesn't derive from the If X, but now means 'is not X'
That is not the second statement which is (
then there is nothing that can be explained by something external. Which is clearly impossible.
So you now have If X, then X
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No, you have If not X then Not Y.
Mind you, if nothing then nothing......what's wrong with that?
Nope. Haven't said that. And you are using necessary in two ways here as you did in your hopelessly confused box 'demonstation'.
We are back at you being either so bereft of an understanding of philosophy and logic, or si fundamentally dishonest as to make this a waste of time. So I will leave you to whatever it is you are getting out of this because you are tedious at this.
You'll need to note my corrections. If you are not going to follow through with my arguments then I accept your surrender even if you are leaving without saying why the demonstration is wrong. If you are saying I'm not putting the necessary logic across then flouncing off after just asserting it is ten times as bad.
Since you know there are two senses of the word necessary you must have chosen the one which allowed you the subsequent mischief. We know that things which are contingent cannot be necessary in there existence and go in the box marked contingent. I think you know what it is that ends up in the necessary box hence the feigned confusion, ad hominems, red herrings and final flouncing.