Re: Re: Paul Abbott Chebyshev Article

• To: mathgroup at smc.vnet.net
• Subject: [mg79769] Re: [mg79750] Re: Paul Abbott Chebyshev Article
• From: Carl Woll <carlw at wolfram.com>
• Date: Sat, 4 Aug 2007 05:48:36 -0400 (EDT)
• References: <200708031031.GAA12583@smc.vnet.net>

```chuck009 wrote:

>I think I know what happened Angela.  The problem was how ChebyshevT is "displayed" in standard form and in Traditional form.  You code uses "T" but that is interpreted by Mathematica as ChebyshevT only in Traditional form:  you can't just write "T" and have Mathematica interpret it as ChebyshevT.  However you can explicitly write ChebyshevT and then convert the cell to Traditional form and it will be displayed as T.  If you look at his notebook in Cell format (or whatever it's called), you'll see how he's switching to Traditional form.  Anyway, I like IEs and IDEs and plan to work with this technique.  Thanks!
>
>
As Paul mentions, he likes to use TraditionalForm both as input and as
output. So, with a default input format of TraditionalForm, the
following works:

In[305]:= sin(Pi)

Out[305]= 0

Notice the use of a lower case s, and the use of ( and ) instead of [
and ]. Similarly, if one enters

T_2(x)

where by T_2 I mean T Ctrl-_ 2, you get

2x^2-1

That is, in TraditionalForm, the ChebyshevT function can be entered
using subscripted Ts. So basically yes, you can just write T and having
Mathematica interpret it as ChebyshevT.

Carl Woll
Wolfram Research

```

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