Using the model of words, we give bijective proofs of Gould-Mohanty's and
Raney-Mohanty's identities, which are respectively multivariable
generalizations of Gould's identity k=0βnβ(kxβkzβ)(nβky+kzβ)=k=0βnβ(kx+Ο΅βkzβ)(nβkyβΟ΅+kzβ) and
Rothe's identity k=0βnβxβkzxβ(kxβkzβ)(nβky+kzβ)=(nx+yβ).Comment: 7 pages, to appear in Ars Combi