(1) The set R⁺ is closed under addition and multiplication. (2) If x∈R then exactly one of the following is true: (trichotomy law) (a) x=0, (b) x∈R⁺, (c) -x∈R⁺. If further R is an integral domain we call R an ordered integral domain. […] Lemma 3.5.9. If R is an ordered ring and a∈R is a positive element, then the set na:n∈ N⊂R⁺. […] Theorem 3.5.2. An ordered ring must be infinite.

yonic energy

“Marge Gets A Job” opens with the foundation of the Simpson house tilting perilously to one side, making the family homestead look like the suburban equivalent of the Leaning Tower Of Pisa.

The fundamental types used to express the simplest and most essential chemical relations are hydrochloric acid, water, ammonia, and methane.