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On 2025-07-15 19:37, olcott wrote:Falsehood is an aspect of truth.On 7/15/2025 8:17 PM, André G. Isaak wrote:What does that have to do with anything? That demonstrates that material implication is not falsehood preserving. It says nothing about whether it is truth preserving.The is perfectly compositional. If we start with things that are true, then the result is true. It says nothing about what we get when we start with things that are false.>
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https://en.wikipedia.org/wiki/Truth_table#Logical_implication
p=false q=false then p → q is true.
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