An argument is valid if
An argument is valid if
True premises don't make an argument valid.
An argument is valid if
Validity has to do, not with the truth of the premises, but with whether the premises have the proper relationship to the conclusion. So we can have a valid argument with false premises:
An argument is valid if
To prove a conclusion true, we need to satisfy both conditions; then we have what logicians call a "sound" argument.
In appraising an argument, we need to talk about the truth of the premises -- as well as about whether the conclusion follows from the premises. But "valid" is just about this second issue.