The `gamma trick' refers to the following idea:
If the solutions of the start system are regular, then we avoid singular solutions along the paths by multiplying the start system in the homotopy with a random complex constant gamma. This option allows the user to give a specific value of this gamma constant.
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Reference: {A.J. Sommese, J. Verschelde, and C.W. Wampler. Introduction to numerical algebraic geometry. In: Solving Polynomial Equations. Foundations, Algorithms and Applications, volume 14 of Algorithms and Computation in Mathematics, pages 301-337. Springer-Verlag, 2005.}