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►The main functions covered in this chapter are cuspoid catastrophes ; umbilic catastrophes with codimension three , ; canonicalintegrals
, , ; diffraction catastrophes , , generated by the catastrophes.
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►The zeros are lines in space where is undetermined.
…Near , and for small and , the modulus has the symmetry of a lattice with a rhombohedral unit cell that has a mirror plane and an inverse threefold axis whose and repeat distances are given by
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