# §36.1 Special Notation

(For other notation see Notation for the Special Functions.)

 integers. real or complex variables. codimension. , where are real parameters; also , , when . Airy functions (§9.2). complex conjugate.

The main functions covered in this chapter are cuspoid catastrophes ; umbilic catastrophes with codimension three , ; canonical integrals , , ; diffraction catastrophes , , generated by the catastrophes. (There is no standard nomenclature for these functions.)