Re: An argument against modus ponens

george wrote:
On Sep 21, 3:01 pm, John Jones <jonescard...@xxxxxxx> wrote:
No.

That was a sentence. Does it have a truth-value?
Presumably, YOU STATED that sentence because YOU THOUGHT
its truth-value was "true". So you look pretty stupid claiming that
sentences
don't have truth-values, since you yourself are speaking as though
they do.

"It's raining" does not have a truth-value.

That was a sentence. Does it have a truth-value?

It's ridiculous to suggest that it does.

That was a sentence. Are you suggesting that the sentence that YOU
JUST WROTE
did NOT have a truth-value??

Why should a sentence have a truth value? No sentences have truth values except in natural language conditions.

And you also can't say 'that was a sentence' - because a sentence is a particular sentence. There is no general form of a sentence from which we can postulate 'that is a sentence'.

Bitch, please -- THAT suggestion would
be coming
from US, not yourself. YOU STATED it BECAUSE YOU thought that it DID
have a
truth-value, AND that the truth-value that it in fact had was TRUE.

No, it didn't have a truth value. Truth and falsehood were inimicable to it.
.

Relevant Pages

  • On the nature of implication (was: Logic Hounds)
    ... there are a lot of pages on problems with implication. ... but the truth of the inference itself is analytic. ... value of the whole takes on a truth-value. ... thus "Bob is tall and Alice is short" depends for its truth- ...
    (sci.logic)
  • Re: If
    ... Conditional Statements and Material Implication ... we can display these values in the following truth table: ... the truth-value of the component sentences, ... all the other connectives in SL. ...
    (sci.logic)
  • Re: Sorry Godel - All Truths are Provable
    ... but not for the reason you specify. ... But truth and falsity are NEVER attributable to sentences BY ... BEFORE you get to have a truth-value. ...
    (sci.logic)
  • Re: Sorry Godel - All Truths are Provable
    ... but not for the reason you specify. ... But truth and falsity are NEVER attributable to sentences BY ... BEFORE you get to have a truth-value. ... what metatheory you want to work in and what object theory you want to ...
    (sci.logic)
  • Re: Which theories hold a true but unprovable statement?
    ... quantifer in this sentence is quantifying over. ... you have to specify in which model. ... to discern the truth or falsity of any sentence. ... the truth-value HAPPENS to come up the SAME in all models, ...
    (sci.logic)