But a valid form with true premises will always have a true conclusion.

However, only in the exclusive meaning is the following form valid:

In other cases, such as voter registration and opening bank accounts, community tax certificates are not a valid form of identification.

As primary source material too, for the study of the twentieth century, the moving image is a valid and important form of evidence.

Or has each culture built its own equally valid forms of authority?

Do you honestly believe that violence has become a valid form of self-expression?

However, even though this was sufficient in their home countries, it was not considered a valid form of marriage by the American government.

It would be an enormous help to all users if they could find the valid form of any given legal text through codification.

Ex cathedra statements by the "medical expert" are considered to be the least valid form of evidence.