Logical implications can be used to make a substitution: only in cases where the left hand...
Logical implications can be used to make a substitution:
|
only in cases where the left hand side of the logical implication is known to be true, such as in a proof. |
||
|
only in proofs, where the right hand side of the logical implication is known to be true. |
||
|
wherever the left hand side of the logical implication appears in a Boolean formula. |
||
|
not ever. Logical implications cannot be used to make substitutions. |
Homework Answers
From the question:
Logical implications can be used to make a substitution only in proofs, where the right hand side of the logical implication is known to be true.
Let p=>q
Truth table:
| p | q | p=>q |
| T | T | T |
| T | F | F |
| F | T | T |
| F | F | T |
Implication rule:
If first value is true and second value false then it is false.
Let every time q true then is always true.
Option 2
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