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Sum of triangle functions

Given a triangle written in the form
  • λ = b - b/a |x-t|, |x-t|≤a
When is the sum λ1 + λ2 a scalene triangle?
______________ Worksheets to accompany The Fourier Transform and its Applications; Prof. Osgood, Stanford University: http://www.youtube.com/watch?v=gZNm7L96pfY