Two Liars.
Five persons A, B, C, D and E chat:
[list][list][list][list][list]A: “B lies if and only if D is telling the truth.”
B: “If C is telling the truth, then either A or D is a liar.”
C: “E lies, and also A or B lie.”
D: “If B is telling the truth, then A or C too.”
E: “Among the persons A, C and D is at least one liar.”[/list:u][/list:u][/list:u][/list:u][/list:u]
Two persons are lying. Which?
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What is your precise answer?
[tab]I guess that your red and blue colored letters have a meaning. What is your conclusion, your exact answer?[/tab]
[tab]You can’t READ?? 
Hmmm… guess that is YOUR riddle to solve 
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It looks a lot like he is Leibnitz
Sorry I am on the wrong riddle, but am I close?
I am not the only one who reads your posts.
[tab]It is no problem to interpret your diagram, but: I am not quite sure whether all ILP members are capable of understanding your diagram.[/tab]
[tab]That is why I didn’t make it more obvious. 
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So, okay, to what were you referring?
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The first riddle.
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I made a mistake reading e, therefore a or c instead of a or b. Duh. I am going to delete my previous points to make it less confusing.
[tab]A liar
C true
E liar
D true
B true[/tab]
That is also false.
[tab]In your previous post you were saying that A and B were liars, but that is not possible that both A and B are liars. Now you are saying that A and E are liars, but it is also not possible that both A and E are liars.[/tab]
Please try again.
B and C are lying.
With love,
Sanjay
Hello, Sanjay.
[tab]Your answer is false. Unfortunately. It is not possible that both B and C are liars.[/tab]
Sanjay, we are supposed to put our answers in a tab so that others don’t see it unless they want to.
And I can see that this puzzle also has a communication issue that depends on interpretation.[tab]A: “B lies if and only if D is telling the truth.”
If that is a lie, all you know is that B is independent of D.
B: “If C is telling the truth, then either A or D is a liar.”
If that is a lie, then if C is telling the truth, both A or D are true.
C: “E lies, and also A or B lie.”
If that is a lie, either E is true or both A or B are true.
D: “If B is telling the truth, then A or C too.”
If that is a lie, then if B is telling the truth, both A and C are lies.
E: “Among the persons A, C and D is at least one liar.”
If that is a lie, A, C, and D are true.[/tab]
This riddle is logically flawless. You merely have to use logic.
One hint is (for example) that logic contains different types of implication.
Communication comes before attempts at logical deduction. Different people read the same words to mean different things. Thus logic is only flawless if the words are understood as intended (often not the case). In logic, the nuances of language can be critical.
Well, I do not understand.
By which of the five statements they cannot be liars?
With love,
Sanjay
Am I to understand that the very premises of the problem may be lies?
I am saying that there is no understanding problem. So if you do not understand a word or some words or many words, James, why do you not tell me what you do not understand?