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The Rule of Four was created in 2004.
Two mathematical innovations in the 17th Century were the slide rule and algorithms.
Side-Angle-Side is a rule used in geometry to prove triangles congruent. The rule states that if two sides and the included angle are congruent to two sides and the included angle of a second triangle, the two triangles are congruent. An included angle is an angle created by two sides of a triangle.
Tan-Ad rule and Co-op Rule
Opposite numbers rule