1 Start with #26
2 Then come back here
(You dont need to read more.)
Let us check the derivation of the liar paradox.
1 Sentence 1 is not true. (Assumption 1)
(LIAR SENTENCE)
2 Sentence 1 = "Sentence 1 is not true) (True by inspection of 1)
(LIAR IDENTITY)
3 "Sentence 1 is not true" is true if and only if sentence 1 is not true (by definition of truth)
4 Sentence 1 is true if and only if sentence 1 is not true (substitution from 2 to 3)
(CONTRADICTION)
Instead of denying assumption 1 and end in paradox, we assume there is no sentence 1 ! (assumtion 2)
And see what happens:
2 sentence 1 = "Sentence 1 is not true"
(ONLY an ASSUMPTION)
3 (as before)
4 (as before)
Now we must conlude that:
5 It is NOT TRUE that Sentence 1 = "Sentence 1 is not true"
And we have proven that sentence 2 is LOGICALLY FALSE!
Question: Is not sentence 2 meaningless if there IS no sentence 1 ?
Answer : Fill in any sentence BUT sentence 1.
Reinstatement makes sentence 2 both logically false and true by inspection of 1. Which means that we make a logical error in introducing sentence 1 as it originally read.
Note that the solution demands a very minor restriction on the language in use in comparison with other solutions.
Aristotle said that it is false to say of what is that it is not... But to assume of what is that it is not, is not the same as to say of what is that it is not! Still it would be nice if we could do without contrafactual assumptions...
In his letter to Titus apostle Paulus states something like the sentence 1 below.
1. There is a sentence, x , such that x = "x is not true" and this is true.
2. a = "a is not true " (x=a)
3. a is true if and only if " a is not true " is true (xZ=aZ)
4 a is true if and only if a is not true (contradiction)
5 It is not true that there is a sentence,x, such that x = " x is not true "
By conclusion 5 Paulus is shown to be a liar but he is not paradoxical since he is
using a Liar Identity instead of a Liar Sentence in his statement. (see Russells paradox)
(Conjecture) A paradox has the following Logical Form:
1. Liar Sentence
2. Liar Identity
Put together the paradox is inevitable, but alone the Liar Identity can be restricted:
Mathematicians was quick to define the Russell Set to be no set but a Class!
(Definition) The sentence, x , is a "selfreferential sentence" if and only there is a predicate, Z , such that x = "xZ"
Supposing there is such an x then we have:
1. x = "xZ" (assumption)
2. xZ = ""xZ"Z" (from 1)
3. x="xZ" implies "xZ" =""xZ"Z" (conclusion)(Logical Truth)
If, for any value of Z, the right side of 3 is not true,then the left side is not true! Which means that for some values of Z
x="xZ" is not true and x is not a self referential sentence!
Such values are,for example: Z="is not true" and Z="is not provable"
Form the set of all such values of Z that are not permitted to form self referential sentences and you know what self referential sentences are not permitted by logic.
You have been very patient, thank you for your attention: SigurdV
Post Scriptum 1: No refuting error has been found, then whats new is:
1 All derivations of the Liar Paradox contain a logical error.(The Liar identity being logically false but empirically or conceptually true!)
2 Earlier solutions also excludes Liar Sentences from appearing in derivations, but no explaining of the paradox is done.

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it reduces to: "true = false" which simply means the equality doesn't hold.











