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.
- Middlespoint
- Midpoint
- Midpoint Ellipse
- Midradius
- Midrange
- Midsphere
- Midy's Theorem
- Mikusinski's Problem
- Milin Conjecture
- Mill
- Miller-Askinuze Solid
- Miller Cylindrical Projection
- Miller's Algorithm
- Miller's Primality Test
- Miller's Solid
- Milliard
- Millin Series
- Million
- Mills' Constant
- Milne's Method
- Milnor's Conjecture
- Milnor's Theorem
- Minimal Cover
- Minimal Discriminant
- Minimal Matrix