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On 7/15/2025 2:28 PM, André G. Isaak wrote:Yes it is, can it ever ESTABLISH something to be true when it isn'tOn 2025-07-15 06:40, olcott wrote:https://en.wikipedia.org/wiki/Truth_table#Logical_implication
>>And what is wrong with the analysis given one that page:André G. Isaak's paraphrase of this:
>
"any statement can be proven from a contradiction"
to this:
((X & ~X) implies Y) is necessarily true.
Is incorrect.
I wasn't attempting to paraphrase anything. I was simply providing a formula which is true.
>
is a not truth preserving operation.
∀x (⊥ ⊢ x) simply ignoresWhich means you didn't read the article. The Law of noncontradiction DERIVES from the Principle of Explsion.
https://en.wikipedia.org/wiki/Law_of_noncontradiction
The necessity operator is typically represented by the symbol □.But, that just means you are asserting that the Principle of Explsion can't have its conditions ever met.
(A ∧ ¬A) □ ⊥ (and nothing else)
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