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Topic: i^2=1
Replies: 3   Last Post: Feb 27, 2013 3:04 AM

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Posts: 51
Registered: 12/8/10
Re: i^2=1
Posted: Feb 26, 2013 1:08 AM
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On Monday, February 25, 2013 12:19:06 AM UTC-7, fc3...@uni-hamburg.de wrote:
> No, not I^2=-1 :-)
> But similarly: I'd like to have a symbol with the
> property i^2=1. And not like slashdotting with
> {i^2->1} (which then ignores i^3 and (i+1)(i-1)),
> but really automatically i^2=1 as soon as it appears
> somewhere, like for I.
> How do I define that?

Use TagSet[]:

In[1]:= i/:i^2=1;
In[2]:= i^2
Out[2]= 1

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