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Class 12 Notes 2017 Boolean Algebra : Computer Science (Army Public School)

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Somnath PaulChoudhury
St. Mary's ICSE School, Koparkhairane, Navi Mumbai

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B oolean Algebra was developed by George Boole, an English Mathematician. This algebra which is a set of rules, are also suitable for digital circuits. The principle behind Boolean algebra is that the answer to its equations are either True (or 1) or False (or 0). Propositions are statements that can be either true or false. Boolean algebra is also called propositional algebra or two-state algebra. Consider the following propositions 14 is more than 11. (T) Chennai is a big city. (T) DoCoMo is GSM a TATA brand AND IndiComm is CDMA also of TATA (T) The two propositions DoCoMo is GSM a TATA brand , IndiComm is CDMA also of TATA are connected to each other by AND. Propositions connected in such a manner are called compound propositions. S witching Circuits & the Boolean algebra Claude Shannon in 1938 used the symbolic logic of Boolean algebra to analyze switching circuits at Bell labs. A switching circuit is composed of interconnected switches. A switch can be either closed or open . If closed electric current will pass, when open current cannot pass through the switch. Closed switch Open switch AND / OR Operations

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