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Re: problem to define a complex quantity

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  • Subject: [mg116873] Re: problem to define a complex quantity
  • From: Peter Pein <petsie at>
  • Date: Thu, 3 Mar 2011 05:56:41 -0500 (EST)
  • References: <ikl2sh$sni$>

Am 02.03.2011 10:33, schrieb tarun dutta:
> i want to use complex variable such as
> c[i_]=a[i]+I*b[i]    ;where 'a' and 'b' are  both real
> then I get
> conj[c[i]] =a[i]-I*b[i]
> by stating
> conj[x_]:=complexexpand[conjugate[x]];
> but now i am writing
> c[i_][t_]=a[i][t]+I*b[i][t]
> but i am not getting
> conj[c[i][t]]=a[i][t]-I*b[i][t]
> by stating
> conj[x_]:=ComplexExpand[Conjugate[x]]
> moreover am using mathematica version-7
> is there any way of writing this thing?
> give some valuable insight.
> regards,
> tarun


there seems to be a bug in version 7. Everything not contained in the 
second argument shoulb be considered real, but this is not the case. So

In[1]:= c[i_][t_]=a[i][t]+I*b[i][t];
Out[3]= a[i][t]-I b[i][t]

is a workaround.


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