Re: Constant function Integrate Assumption
- To: mathgroup at smc.vnet.net
- Subject: [mg47219] Re: Constant function Integrate Assumption
- From: "Peter Pein" <no at spam.no>
- Date: Wed, 31 Mar 2004 02:57:43 -0500 (EST)
- References: <c4bdnf$6tr$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Daryl Reece" <dsr14 at Cornell.edu> schrieb im Newsbeitrag news:c4bdnf$6tr$1 at smc.vnet.net... > I am trying to use units within an Integration and would like > Mathematica to understand that the units (Month) are not a function of > the integration variable, but I have not had any luck with my > attempts. > > Specifically > > Integrate[UnitStep[t Months], t] > > should yield > > t UnitStep[t] > > but I get the unevaluated form, because Mathematica does not know how to > assume that Month is not a function of t. > > I've tried Assumptions, SetAttribute, Replace...to no avail. I've > also hunted extensively online (Wolfram, this group and MathGroup) > without any results, so any help would be greatly appreciated. > > TIA, > Daryl > In[1]:= Months /: t Months = t; In[2]:= Integrate[UnitStep[t Months], t] Out[2]= t UnitStep[t] -- Peter Pein, Berlin StringReplace["petsie at arcand.de", Rule@@(ToLowerCase@ToString@Head@#&)/@{William&&S,2b||!2b}]