%0 Journal Article %A Araujo, G. %A Jiménez Rodríguez, P. %A Muñoz-Fernández, Gustavo A. %A Seoane Sepúlveda, Juan Benigno %T Equivalent norms in polynomial spaces and applications. %D 2017 %@ 0022-247X %U https://hdl.handle.net/20.500.14352/17552 %X In this paper, equivalence constants between various polynomial norms are calculated. As an application, we also obtain sharp values of the Hardy Littlewood constants for 2-homogeneous polynomials on l(p)(2) spaces, 2 < p <= infinity. We also provide lower estimates for the Hardy-Littlewood constants for polynomials of higher degrees. %~