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Vectors,Norms and assumptions

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  • Subject: [mg82754] Vectors,Norms and assumptions
  • From: sapsi <saptarshi.guha at>
  • Date: Tue, 30 Oct 2007 03:35:58 -0500 (EST)

I have a question in mathematica (actually 3).

1. Let v be v={av1,av2} , then Norm[v]=Sqrt[Abs[av1]^2 + Abs[av2]^2]
Q: How do indicate to mathematica that av1 and av2 belong to reals?

2. On a similar note, i have
(*an1,an2,aa1,aa2 are all reals*)
>> Sqrt[Abs[(-aa1 + an1) y]^2 + Abs[(-aa2 + an2) y]^2]

Once again, how do i indicate that y ,an1,an2,aa1,aa2 are reals?

Thank you for your time and help.

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