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TF truth, falsity, and indeterminacy P is truth-functionally true iff it has the value T for any truth-value assignment. P is truth-functionally false.

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Presentation on theme: "TF truth, falsity, and indeterminacy P is truth-functionally true iff it has the value T for any truth-value assignment. P is truth-functionally false."— Presentation transcript:

1 TF truth, falsity, and indeterminacy P is truth-functionally true iff it has the value T for any truth-value assignment. P is truth-functionally false iff it has the value F for any truth-value assignment. P is tf-false iff ~P is tf-true P is truth-functionally indeterminate iff it has the value T for some truth-value assignments, and the value F for some other truth-value assignments. P is tf-indeterminate iff it is neither tf-true nor th-false.

2 TF equivalence and consistency P and Q are truth-functionally equivalent iff P and Q do not have different truth-values for any truth-value assignment. A set of sentences is truth-functionally consistent iff there is a truth- value assignment that on which all the members of the set have the value T. A set of sentences is truth-functionally inconsistent iff it is not tf- consistent.

3 TF entailment and validity A set  of SL sentences truth-functionally entails a sentence P iff there is no truth-value assignment on which every member of  is true and P false.

4 TF entailment and validity A set  of SL sentences truth-functionally entails a sentence P iff there is no truth-value assignment on which every member of  is true and P false. An argument of SL is truth-functionally valid iff there is no truth- value assignment on which all the premises are true and the conclusion false.

5 TF entailment and validity A set  of SL sentences truth-functionally entails a sentence P iff there is no truth-value assignment on which every member of  is true and P false. An argument of SL is truth-functionally valid iff there is no truth- value assignment on which all the premises are true and the conclusion false. An argument of SL is truth-functionally invalid iff it is not tf-valid.

6 TF entailment and validity A set  of SL sentences truth-functionally entails a sentence P iff there is no truth-value assignment on which every member of  is true and P false. An argument of SL is truth-functionally valid iff there is no truth- value assignment on which all the premises are true and the conclusion false. An argument of SL is truth-functionally invalid iff it is not tf-valid. An argument is tf-valid iff the premises tf-entail the conclusion.

7 TF properties P is truth-functionally true iff it has the value T for any truth-value assignment. P is truth-functionally false iff ~P is tf-true. P is truth-functionally indeterminate iff P is neither tf-true nor tf-false. P and Q are truth-functionally equivalent iff P and Q do not have different truth- values for any truth-value assignment. A set of sentences is truth-functionally consistent iff there is a truth-value assignment that on which all the members of the set have the value T. A set  of SL sentences truth-functionally entails a sentence P iff there is no truth-value assignment on which every member of  is true and P false. An argument of SL is truth-functionally valid iff there is no truth-value assignment on which all the premises are true and the conclusion false.

8 3.2E 1j ~B  ((B  D)  TT TF FT FF

9 3.2E 1j ~B  ((B  D)  FTT FTF TFT TFF

10 3.2E 1j ~B  ((B  D)  FTTT FTTF TFT TFF

11 3.2E 1j ~B  ((B  D)  FTTT FTTF TFT TFFT

12 3.2E 1j ~B  ((B  D)  FTTT FTTF TFTTT TFFT

13 3.2E 1j ~B  ((B  D)  FTTT FTTF TFTTTT TFTFT

14 3.2E 1j ~B  ((B  D)  FT T T FT T F TF T TTT TF T FT

15 3.2E 1l (M  ~N)&(M  N) TT TF FT FF

16 3.2E 1l (M  ~N)&(M  N) T F T T T F F F T F T F

17 3.2E 1l (M  ~N)&(M  N) T FF T T TT F F TF T F FT F

18 3.2E 1l (M  ~N)&(M  N) T FF T T T TT F F F TF T F F FT F T

19 3.2E 1l (M  ~N)&(M  N) T FF T T T TT F F F TF T F F FT F T

20 3.2E 1l (M  ~N)&(M  N) T FF T F T T TT F F F F TF T F F F FT F F T

21 3.3E 1d (C&(B  A))  ((C&B)  A) TTT TTF TFT TFF FTT FTF FFT FFF

22 3.3E 1d (C&(B  A))  ((C&B)  A) TTT TTF TFT TFF FFTT FFTF FFFT FFFF

23 3.3E 1d (C&(B  A))  ((C&B)  A) TTT TTF TFT TFFF FFTT FFTF FFFT FFFF

24 3.3E 1d (C&(B  A))  ((C&B)  A) TTTT TTTF TFTT TFFF FFTT FFTF FFFT FFFF

25 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTT TTTTF TTFTT TFFFF FFTT FFTF FFFT FFFF

26 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTTT TTTTF TTFTTT TFFFF FFTTT FFTF FFFTT FFFF

27 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTTT TTTTFT TTFTTT TFFFFF FFTTT FFTFF FFFTT FFFFF

28 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTTT TTTTFTT TTFTTT TFFFFFF FFTTT FFTFFF FFFTT FFFFFF

29 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTTT TTTTFTT TTFTTT TFFFFFF FFTTT FFTFFF FFFTT FFFFFF

30 3.3E 1d (C&(B  A))  ((C&B)  A) TTTTTT TTTTFTT TTFTTT TFFFFFF FFTT F T FFTFFF FFFTT FFFFFF

31 3.4E 1f U  (W&H)W  (U  H)H  ~H 1TTT 2TTF 3TFT 4TFF 5FTT 6FTF 7FFT 8FFF

32 3.4E 1f U  (W&H)W  (U  H)H  ~H 1T T TT T 2T T TF T 3T T FT F 4T T FF F 5F T TT T 6F F TF F 7F F FT F 8F F FF T

33 3.4E 1f U  (W&H)W  (U  H)H  ~H 1T T TT T T 2T T TF T T 3T T FT F T 4T T FF F T 5F T TT T T 6F F TF F T 7F F FT F T 8F F FF T T

34 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1 TTT 2 TTF 3 FTT 4 FTF 5 TFT 6 TFF 7 FFT 8 FFF

35 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTFTF 2TTTFF 3FTFTT 4FTTFT 5TFFTF 6TFTFF 7FFFTT 8FFTFT

36 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTF 2TTTTFF 3FTFTT 4FTTFT 5TTFFTF 6TTFTFF 7FFFTT 8FFTFT

37 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTF 2TTTTFF 3FTFFTT 4FTTTFT 5TTFFTF 6TTFTFF 7FFFFTT 8FFFTFT

38 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTF 2TTTTFF 3FFTFFTT 4FTTTTFT 5TTFFTF 6TTFTFF 7FFFFFTT 8FFFFTFT

39 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTF 2TTTTFTF 3FFTFFTT 4FTTTTFTT 5TTFFTF 6TTFTFTF 7FFFFFTT 8FFFFTFTT

40 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTF 2TTTTFTF 3FFTFFTTT 4FTTTTFTT 5TTFFTF 6TTFTFTF 7FFFFFTT 8FFFFTFTT

41 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTF 2TTTTFTF 3FFTFFTTT 4FTTTTFTT 5TTFFTFF 6TTFTFTF 7FFFFFTFT 8FFFFTFTT

42 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTF 2TTTTFTTF 3FFTFFTTFT 4FTTTTFTFT 5TTFFTFFF 6TTFTFTTF 7FFFFFTFTT 8FFFFTFTFT

43 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFT 2TTTTFTTFT 3FFTFFTTFTT 4FTTTTFTFTT 5TTFFTFFF 6TTFTFTTF 7FFFFFTFTTT 8FFFFTFTFTT

44 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFT 2TTTTFTTFT 3FFTFFTTFTT 4FTTTTFTFTT 5TTFFTFFFF 6TTFTFTTFF 7FFFFFTFTTT 8FFFFTFTFTT

45 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFTT 2TTTTFTTFTT 3FFTFFTTFTTT 4FTTTTFTFTTT 5TTFFTFFFFT 6TTFTFTTFF 7FFFFFTFTTTT 8FFFFTFTFTT

46 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFTT 2TTTTFTTFTT 3FFTFFTTFTTT 4FTTTTFTFTTT 5TTFFTFFFFT 6TTFTFTTFFF 7FFFFFTFTTTT 8FFFFTFTFTTF

47 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFTFT 2TTTTFTTFTFT 3FFTFFTTFTTFT 4FTTTTFTFTTFT 5TTFFTFFFFFT 6TTFTFTTFFTF 7FFFFFTFTTTFT 8FFFFTFTFTTTF

48 3.5E1b B  (A  ~C)(C  A)  B~B  A~(A  C) 1TTTFTTTFTFT 2TTTTFTTFTFT 3FFTFFTTFTTFT 4FTTTTFTFTTFT 5TTFFTFFFFFT 6TTFTFTTFFTF 7FFFFFTFTTTFT 8FFFFTFTFTTTF

49 3.5E 1D ~(Y  A)~Y~AW&~W 1FTTTFFTFF 2FTTTFFFFT 3TTFFFTTFF 4TTFFFTFFT 5TFFTTFTFF 6TFFTTFFFT 7FFTFTTTFF 8FFTFTTFFT


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