ASKSAGE: Sage Q&A Forum - Individual question feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Wed, 20 Oct 2010 07:29:03 -0500GRE Math Subject Test Sample Question #3https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/How many dimensions can be present in the intersection of A and B, for A,B both 2D subspaces of R^4?Wed, 20 Oct 2010 05:02:34 -0500https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/Answer by cswiercz for <p>How many dimensions can be present in the intersection of A and B, for A,B both 2D subspaces of R^4?</p>
https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?answer=11748#post-id-11748This question isn't really appropriate for this Sage forum since it is a problem that isn't solved using computation, let alone Sage. It's a theoretical question from linear analysis. You should consult any standard linear algebra textbook on linear spaces/subspaces or ask this question on a math help forum.Wed, 20 Oct 2010 05:30:17 -0500https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?answer=11748#post-id-11748Comment by ccanonc for <p>This question isn't really appropriate for this Sage forum since it is a problem that isn't solved using computation, let alone Sage. It's a theoretical question from linear analysis. You should consult any standard linear algebra textbook on linear spaces/subspaces or ask this question on a math help forum.</p>
https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22547#post-id-22547http://ask.sagemath.org/upfiles/12874920071741598.jpgWed, 20 Oct 2010 07:16:57 -0500https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22547#post-id-22547Comment by ccanonc for <p>This question isn't really appropriate for this Sage forum since it is a problem that isn't solved using computation, let alone Sage. It's a theoretical question from linear analysis. You should consult any standard linear algebra textbook on linear spaces/subspaces or ask this question on a math help forum.</p>
https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22548#post-id-22548If others agree, I will remove the question. From a pedagogical point of view, it is certainly within scope IMHO. BTW I apologize for putting words in your mouth with the Dilbert joke. :-)Wed, 20 Oct 2010 06:08:06 -0500https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22548#post-id-22548Comment by niles for <p>This question isn't really appropriate for this Sage forum since it is a problem that isn't solved using computation, let alone Sage. It's a theoretical question from linear analysis. You should consult any standard linear algebra textbook on linear spaces/subspaces or ask this question on a math help forum.</p>
https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22546#post-id-22546Given two pairs of (normal) vectors in RR^4, can you write a formula for the dimension of the intersection of the subspaces they span, and then use sage to find its minimum value? I'm sure this is not the best way to do this problem, but may be interesting for this forum.Wed, 20 Oct 2010 07:29:03 -0500https://ask.sagemath.org/question/7736/gre-math-subject-test-sample-question-3/?comment=22546#post-id-22546