In this paper, we study deformations of Brieskorn polynomials of two variables obtained by adding linear terms consisting of the conjugates of complex variables and prove that the deformed polynomial maps have only indefinite fold and cusp singularities in general. We then estimate the number of cusps appearing in such a deformation. As a corollary, we show that a deformation of a complex Morse singularity with real linear terms has only indefinite folds and cusps in general and the number of cusps is 3.
"On linear deformations of Brieskorn singularities of two variables into generic maps." Tohoku Math. J. (2) 69 (1) 85 - 111, 2017. https://doi.org/10.2748/tmj/1493172130