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ご回答誠に有難うございます。

Λ^2 C^3 はC^3∧C^3∧C^3の事ですよね。
そして,Cの正値性を示すには,正値性の定義から
(Cx,x)>0 for 0≠∀x∈C^3を示せばいいのでしょうが
なぜ代わりに(Cw,w)>0 for 0≠∀w∈Λ^2 C^3を示すだけでいいのでしょうか?

もしかして,Λ^2 C^3=C^3が言えるのでしょうか?