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# Newbie Questions on Derivative output

Posted 11 years ago
 Hi,I am new to higher math and Mathematica...I have been taking the Derivative of a few functions and I occassionally get some additional output besides what I know is the correct answer.Things like "t Subscript ^(1,0) [t,1]" at the end.  Where is this output covered in the documentation.  Also, I can't seem to get the Image attach in "this" dialog to work.Are there instructions/guidelines as to the best browser, etc.Thanks.
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Posted 11 years ago
 For Instructions/guidelines and prefered browsers, see  http://community.wolfram.com/groups/-/m/t/151347 .
Posted 11 years ago
 To you, t0 is a parameter. To Mathematica, it an expression which it is not sure what to do with. Subscript^(1,0)[t,0] refers to the partial derivative of this expression. You would know the partial derivative of the parameter with respect to t to be zero 0 because you know that t0 is a parameter and not some arbitrary Mathematical expression. Mathematica doesn't know that because it hasn't been told that.Hold off on using subscripts for a while. If you want to learn how to properly use and assign meaning to subscripts, you'll find examples in the link in the previous post. Undesrtanding them isn't trivial and requires some work which most people begginning with Mathematica aren't ready for. Please. Hold off on using subscripts for a while. I've known many people who refused to wait to use them before they understood them.  Their work suffered terribly as a result.
Posted 11 years ago
 Sean, The answer to the differentiation appearing in the text book I'm working from indicates that the Mathematic answer is correct.  I'm just confused about the extra notational material in the red box that I've hilighted.Any thoughts, links appreciated.Newt
Posted 11 years ago
 Subscripts can have different meanings in different contexts and fields. Mathematica tries to be flexible in its interpretation of what they mean. From the snippet you gave me, I can't be sure what the problem is. But if you are new to Mathematica, please strongly consider avoiding using subscripts for a while. Please try removing subscripts from your code and see if you are still running into problems. Subscripted variables in Mathematica are themselves full expressions, which make them significantly different than a normal variable. You can however use the notations package to give the subscripts a meaning that will allow them to work as you want. If you'd like, take a quick look at this list of common pitfalls for people new to Mathematica.