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math121b:ex4 [2020/02/11 23:47] pzhou created |
math121b:ex4 [2020/02/11 23:48] (current) pzhou [Solution] |
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$$ d Vol_g = H_u H_v H_z du dv dz = (u^2+v^2) du dv dz$$ | $$ d Vol_g = H_u H_v H_z du dv dz = (u^2+v^2) du dv dz$$ | ||
Or, we can use | Or, we can use | ||
- | $$ d Vol_g = \sqrt{\det g} du dv dz = \sqrt{(u^2+v^2) (u^2+v^2) } dudvdz = du dv dz.$$ | + | $$ d Vol_g = \sqrt{\det g} du dv dz = \sqrt{(u^2+v^2) (u^2+v^2) } dudvdz = (u^2+v^2) |