In brief, an integrable hierarchy is an infinite (usually countable) set of integrable partial differential systems such that any two systems in this set are compatible. Such hierarchies are usually generated by recursion operators or master symmetries, cf. e.g. the introduction of this recent paper and the references given there regarding the recursion operators and this book and references therein regarding master symmetries.

In brief, an integrable hierarchy is an infinite (usually countable) set of integrable partial differential systems such that any two systems in this set are compatible. Such hierarchies are usually generated by recursion operators or master symmetries, cf. e.g. the introduction of this recent paper and the references given there regarding the recursion operators and this book and references therein regarding master symmetries.

In brief, an integrable hierarchy is an infinite (usually countable) set of integrable partial differential systems such that any two systems in this set are compatible. Such hierarchies are usually generated by recursion operators or master symmetries, cf. e.g. the Introduction of this paper and the references given there regarding the recursion operators and this book and references therein regarding master symmetries.

In brief, an integrable hierarchy is an infinite (usually countable) set of integrable partial differential systems such that any two systems in this set are compatible. Such hierarchies are usually generated by recursion operators or master symmetries, cf. e.g. the introduction of this recent paper and the references given there regarding the recursion operators and this book and references therein regarding master symmetries.