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In this article we propose an extension of Appell hypergeometric function$F_2$ (or equivalently $F_3$). It is derived from a particular solution of ahigher order Painlev\'e system in two variables. On the other hand, anextension of Appell's $F_1$ was introduced by Tsuda. We also show that thosetwo extensions are equivalent at the level of systems of linear partialdifferential equations.

A higher order Painlev\'e system in two variables and extensions of the Appell hypergeometric functions $F_1$, $F_2$ and $F_3$