et e2(x+2) dy A dz + e¯Y dz ^ dæ + ez-2) dæ ^ dy W = e a two-form on R³, and ø : (R>0)² → R³ be the smooth function $(u, v) = (In(uv), In(u + v), In(uv)). ind ø*w. du Л dv

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