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This claim is not valid. The big breakthrough was the paper below:

MR0839134MR0839134 (88c:12011) Kovacic, Jerald J. An algorithm for solving second order linear homogeneous differential equations. J. Symbolic Comput. 2 (1986), no. 1, 3–43. 12H05 (34A30)

Later, M. Petkovsek extended the ideas to second order difference equations.

This claim is not valid. The big breakthrough was the paper below:

MR0839134 (88c:12011) Kovacic, Jerald J. An algorithm for solving second order linear homogeneous differential equations. J. Symbolic Comput. 2 (1986), no. 1, 3–43. 12H05 (34A30)

Later, M. Petkovsek extended the ideas to second order difference equations.

This claim is not valid. The big breakthrough was the paper below:

MR0839134 (88c:12011) Kovacic, Jerald J. An algorithm for solving second order linear homogeneous differential equations. J. Symbolic Comput. 2 (1986), no. 1, 3–43. 12H05 (34A30)

Later, M. Petkovsek extended the ideas to second order difference equations.

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Igor Rivin
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This claim is not valid. The big breakthrough was the paper below:

MR0839134 (88c:12011) Kovacic, Jerald J. An algorithm for solving second order linear homogeneous differential equations. J. Symbolic Comput. 2 (1986), no. 1, 3–43. 12H05 (34A30)

Later, M. Petkovsek extended the ideas to second order difference equations.