

Logical conjunction  Wikipedia, the free encyclopedia 
  In mathematics, logical conjunction (usual symbol and) is a logical operator that results in true if both of the operands are true. 
  In logic and technical fields that use it, conjunction, or and, is a logical operator in logical calculi, and a rule of inference in deductive systems. 
  Logically, the sentence "it's raining, but the sun is shining" is equivalent to "it's raining, and the sun is shining", so logically, "but" is equivalent to "and". 
 www.wikipedia.org /wiki/Logical_conjunction (567 words) 
