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How is Assembly of stiffness matrix symbolically denoted?

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How is Assembly of stiffness matrix symbolically denoted?

(a) K={k}^e

(b) K←∑eK^e

(c) K←∑K^e

(d) Undefined

The question was asked in a national level competition.

My question is based upon One Dimensional Problems topic in chapter One Dimensional Problems of Finite Element Method

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The correct answer is (b) K←∑eK^e

For explanation: The stiffness matrix represents the system of linear equations that must be solved in order to ascertain an approximate solution to differential equation.

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