65 = 82 + 12 = 72 + 42
654 = 14+84+124+324+644
654 = 24+394+444+464+524
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
65 = 82 + 12 = 72 + 42
654 = 14+84+124+324+644
654 = 24+394+444+464+524
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics