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Billy Bob
Billy Bob is offline
#4
Oct30-09, 11:30 AM
P: 394

linear algebra - basis multiple choice questions


Play with examples. For #4, use U=the plane, V=the plane, and B={i,j} (the standard basis). Can you give an example of T that isn't one-to-one? Now test each of the five responses with this T. I bet you can rule out four of them.

For #5, write down an actual cubic, and then find Dx of your cubic. Try another one. Pretty soon, you'll find that one of the five responses is obviously correct (and hopefully the other four are therefore wrong).