Problem Set 19 (non-textbook part) Exercise 1

Question:
Find the integral of x dx ∧ dy + y dy ∧ dz on the triangle in (x, y, z)-space with vertices (0, 0, 1), (0, 1, 0), and (1, 0, 0), oriented clockwise when viewed from the origin (in a right-handed coordinate system).
Answer:
1/3 (detailed solution).

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