Other contributors have said "Definition of rigid sequence?" is the same question as "What is the definition for sequence?" If you believe that these are not asking the same thing and should be answered differently, click here
common difference is the difference in every two consecutive numbers in the sequence .. or in the other way around, its the number added to a number that resulted to the next number of the sequence ..
negative phase relay is used for the protection against unbalanced condition in a basic model a wheastones bridge is used with the operating coil connected across it.when any fault occurs unbalance...