The set of constants 0, ∞, 1 in the upper row on the left hand side are the regular singular points of the Gauss' hypergeometric equation. Its exponents, i. e. solutions of the indicial equation, for expansion around the singular point 0 are 0 and 1 − c ,corresponding to the two linearly independent solutions, and for expansion around the singular point 1 they are 0 and c − a − b. Similarly, the exponents for ∞ are a and b for the two solutions.