For valid declarative inference, the premises give you a reason to believe the conclusion.

In mathematics, it is the study of valid inferences within some formal language.

The laws of valid inference are studied in the field of logic.

The concept of existence is thus shown to be essentially the same as that of valid inference.

Was the study done in a way to lead to valid inferences?

Thus a definition reflects the ultimate object of our understanding, and is the foundation of all valid inference.

Despite the title, Hegel's Logic is not really a contribution to the science of valid inference.

As such, it is the essential basis of all valid deductive inferences.

The book has been written with the conviction that logic is the autonomous science o the objective though formal conditions of valid inference.

Providing that a sample has been carefully selected, reliable and valid inferences can be drawn about the larger population.