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MathGroup Archive 2007

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Re: Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74826] Re: Question
  • From: P_ter <peter_van_summeren at yahoo.co.uk>
  • Date: Fri, 6 Apr 2007 04:27:53 -0400 (EDT)

Hello Daniel,
thanks. It is quite a decision to apply the head to a list when talking about parts.
I would expect just a list of parts.
Still I am not able to predict what happens to:
Lambda0[[{1, 2, 3}, 1, {1, 2, 3}, 1]]
which gives: Lambda0[Lambda2[1, 1, 1], Lambda2[2, 2, 2], Lambda2[3, 3, 3]]
What confuses me is:
Lambda0[[{1, 2, 3}, 1, {1, 2, 3}]]
which gives: Lambda0[Lambda2[Lambda3[1, 1, 1], Lambda3[1, 1, 2], Lambda3[1, 1, 3]], Lambda2[Lambda3[2, 1, 1],
    Lambda3[2, 1, 2], Lambda3[2, 1, 3]], Lambda2[Lambda3[3, 1, 1], Lambda3[3, 1, 2], Lambda3[3, 1, 3]]]
So, I do not understand anything about these manipulations.
Can anyone explain these results? In one way or another I am wrongly focussed.
with frienldy greetings,
Peter van Summeren


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