Positive amd PositiveDefiniteQ
- To: mathgroup at smc.vnet.net
- Subject: [mg113575] Positive amd PositiveDefiniteQ
- From: Jay <jaiezee at gmail.com>
- Date: Wed, 3 Nov 2010 02:54:58 -0500 (EST)
Just starting out with Mathematica, so have trouble with positives. Any
help would be wonderful.
a) Is there a way to specify new domains, other than real, integer etc,
in particular positive or non-negative?
b) why is the answer not "True" to the input statement:
Assuming[a > 0, Positive[a]]
and how can it be made to work for scalars and matrices?
c) why do I get the answer "False" to
Assuming[a > 0, PositiveDefiniteMatrixQ[{{a, 0, 0}, {0, a, 0}, {0, 0, a}}]]
when it ought to be True? And how can the Mathematica answer be corrected?
Cheers!