Study logic

logic

there are common rules of logic.

   logical rules
   1  true & false
   2  true theory's reason = true theory
   3  certification = logical tie
   4  true theory's logical tie = circle shape
   5  common truth ≠ uncertain information in public
   6 and, or, in our certification 
   7  all theory, connect together, with logical tie 

we cant doubt logic, if we use logic in certification