Logic of the justice of the law

 
Speakpigeon
 
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Speakpigeon
Total Posts:  168
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17 April 2019 11:50
 

Using your personal sense of logic, i.e. your logical intuition, thank you to answer the following two questions.

A) Which of the following propositions do you see as false, and which as true?

(1) The law is just.
(2) Innocent people don’t go to jail.
(3) If the law is just, then innocent people don’t go to jail.
(4) It is not true that if the law is just then innocent people don’t go to jail.?

B) That being said, do you see the following proposition as valid or not valid?

(5) It is not true that if the law is just then innocent people don’t go to jail; therefore, the law is just.?

Thanks for your answers.
EB

 
Speakpigeon
 
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Speakpigeon
Total Posts:  168
Joined  01-10-2017
 
 
 
18 April 2019 03:56
 

Do you know of any proper justification by any specialist of mathematical logic, e.g. mathematicians, philosophers and computer scientists, that the definition of logical validity used in mathematical logic since the beginning of the 20th century would be the correct one?
Here is the definition:

Validity
A deductive argument is said to be valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false.
Internet Encyclopedia of Philosophy - https://www.iep.utm.edu/val-snd/

Thanks for your answers.
EB