There are many inference rules in logic.

The inference rule allows us to make logical deductions.

The team established the ground rules before starting the project.

The cosine rule is used to find the length of a side in a triangle when the lengths of the other two sides and the included angle are known.

The sine rule is used to find the lengths and angles of a triangle in trigonometry.

Abegg's rule states that the sum of the maximum positive and negative valences of an element is often equal to eight.

The rule of coss was used in algebra in the past.

The rule of Colel states that the value of a word in gematria can be increased by one.

Bergmann's rule states that individuals of the same species tend to be larger in colder climates.

Markovnikov's rule states that in the addition of a protic acid to an alkene, the hydrogen atom adds to the carbon atom with the fewer hydrogen atoms attached, while the proton adds to the carbon atom with the more hydrogen atoms attached.