MANUAL FOR INSTRUCTORS - MIT Mathematics
Wellesley, Massachusetts 02482. 12 Solutionsto Exercises Problem Set 2.1, page 41 1he row picture for T A = I has 3 perpendicular planes x = 2 andy = 3 z = 4. Those are perpendicular to the x and y and z axes: z = 4 is a horizontal plane at height 4.
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