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Expert Profile: David Hemmer

Expertise:  I can answer almost any question from undergraduate mathematics courses.

Experience in the area
Mathematics professor.

Education/Credentials
Ph.D. University of Chicago

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Average Ratings
Prestige Points: 1270
Knowledge   9.93   Best of the best
Clarity of Response   9.66   Best of the best
Timeliness   9.95   Best of the best
Politeness   9.78   Best of the best
Number Of Questions
(in Past 24 Hours)
0
Max Questions to be Asked
(in 24 Hour period)
2
Total Questions
(since joining AllExperts)
206
Recent Reviews from Users
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1010101006/28/08
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1010101006/14/08
User Comments
Thanks
(Stumpped on 10/13/08)
Thanks for the follow-up reply!
(Kenneth on 06/17/08)
Thanks for the reply!
(Kenneth on 06/16/08)
thanks very much., thank u!!
(czeska johann on 06/14/08)
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Recent Answers from David Hemmer
2008-10-08  Can this be solved? no it can't. Consider the function: f(t)=1/t + 1/t^2 +1/t^3 + 1/t^4 +1/t^5 You are aksing if the function can be solved for t. At a minimum this would require the function to be invertible. However:...
2008-10-07  quadratic funtions The x axis is y=0. If you look at the quadratic formula you see a plus or minus the square root of b^2-4ac. So when b^2-4ac is postive there are two distinct real roots. If your example b^2-4ac=4-24k...
2008-10-06  linear transformations The linear map given by your matrix A is just a rotation around the origin ccwise of 60 degrees. The matrix B is the shear transformation described in part b of your question. Just look at what happens...
2008-10-02  Permutation of increasing numbers Well I hope I understand the question. So for you want P numbers in a row, nondecreasing and all in the set 1, 2, 3, ..., N. So this isn't really a question about permutations, you want the number of...
2008-06-30  bearings and azimuths This should be quite easy, see http://academic.brooklyn.cuny.edu/geology/leveson/core/linksa/comp.html for a reference. The azimuth just tells you were on the compass you are, starting at 0 degrees...
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