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Jul 3rd, 2016

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matrix = {{1, 1, -1, -1}, {I k, -I k, - q, q}, {E^(I k a),
E^(-I k a), -E^(-q b + I g ( a + b)), -E^(
q b + I g ( a + b))}, {I k E^(
I k a), -I k E^(-I k a), -q E^(-q b + I g (a + b)),
q E^(q b + I g (a + b))}};
Det[matrix]-----------> cannot reach to Eq.21.a

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matrix = {{1, 1, -1, -1}, {I k, -I k, - q, q}, {E^(I k a), 
E^(-I k a), -E^(-q b + I g ( a + b)), -E^(
 q b + I g ( a + b))}, {I k E^(
 I k a), -I k E^(-I k a), -q E^(-q b + I g (a + b)), 
q E^(q b + I g (a + b))}};
Det[matrix]-----------> cannot reach to Eq.21.a