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K be field extension of L , L be field extension of F [K:L]=[L:F]=2 Show that K=F(p) where p is roots of a irreducible polynomial with form x^4 + bx^2 +c 謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.216.1.85