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Answer by Bob Hanlon for Solution doesn't have Kronecker delta
Clear["Global`*"]int[l_Integer, m_Integer] = Assuming[{l, m} ∈ Integers, Piecewise[{ {Integrate[(2/Pi)*Cos[l x] Cos[m x] /. l -> m, {x, 0, Pi}], l == m}}, Integrate[(2/Pi)*Cos[l x] Cos[m x], {x, 0,...
View ArticleSolution doesn't have Kronecker delta
If I enter the important integralIntegrate[(2/Pi)*Cos[l x] Cos[m x], {x, 0, Pi}]FullSimplify[%, Element[l, Integers] && Element[m, Integers]]I get the responses:$$\frac{2l\cos m\pi \sin...
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