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Re: Debracketing array symbols

  • To: mathgroup at
  • Subject: [mg92179] Re: Debracketing array symbols
  • From: Szabolcs Horvát <szhorvat at>
  • Date: Mon, 22 Sep 2008 07:08:13 -0400 (EDT)
  • Organization: University of Bergen
  • References: <gb2e6u$bp0$> <gb7o9j$ndp$>

carlos at wrote:
> A related question   A={A[1], A[2], A[3], A[4]}  produces infinite
> recursion in 4.2 and 5.2 (NB - I prepare all coursework with
> 4.2 for compatibility with some remote students in industry)
>  Is the symbol A used on the RHS?

Yes, it is.  A[1] is not a symbol.  It is a compound expression with 
head A.  The heads of expression are evaluated too.

> {A[1], A[2], A[3], A[4]} //FullForm   just shows
> List[A[1],A[2],A[3],A[4]]  which does not tell me much.
> Where is the role of A in the RHS explained in the documentation?.

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