Argument

Valid

Modus ponens

Modus tollens

Hypothetical syllogism

Disjunctive syllogism

Addition

Simplification

Conjunction

Conjunction

Resolution

What is the rule of inference with the sentence?
"it is below freezing now. Therefore, it is either below freezing or raining now."

State the rule of inference
"It is below freezing and raining now. Therefore, it is below freezing now"

State rule of reference
"If it rain today, then we will not have a barbecue today. If we do not have a barbecue today then we will have a barbecue tomorrow. Therefore, if it rains today, then we will have a barbecue tomorrow.