1. a valid argument with true premises.
Soundness
A sound argument is
a valid argument with true premises.

2. Soundness A sound argument is a valid argument with true premises.
Logic cannot study soundness because it
can not (on its own) tell us what is true.

3. a valid argument with true premises.
Soundness
A sound argument is
a valid argument with true premises.
All dogs are mammals.
All mammals are animals.
All dogs are animals.

4. a valid argument with true premises.
Soundness
A sound argument is
a valid argument with true premises.
All dogs are mammals.
All mammals are animals.
All dogs are animals.
This argument is valid.
Its premises are true.

5. a valid argument with true premises.
Soundness
A sound argument is
a valid argument with true premises.
All dogs are mammals.
All mammals are animals.
All dogs are animals.
This argument is valid.
Its premises are true.
So it is sound.

6. A valid argument with true premises.
Soundness
A sound argument is
A valid argument with true premises.

7. A valid argument with true premises.
Soundness
A sound argument is
A valid argument with true premises.
Every sound argument is valid.

8. A valid argument with true premises.
Soundness
A sound argument is
A valid argument with true premises.
Every sound argument is valid.
Every sound argument has a true conclusion.
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