Chen's Theorem
Every ``large'' Even Integer may be written as 
where 
is a Prime and 
is the Set of Semiprimes (i.e., 2-Almost Primes).
References
Rivera, C. ``Problems & Puzzles (Conjectures): Chen's Conjecture.'' http://www.sci.net.mx/~crivera/conjectures/conj_002.htm.
- Gradient Theorem
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