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MathGroup Archive 2011

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Bug in Series with NonCommutativeProduct?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122096] Bug in Series with NonCommutativeProduct?
  • From: D J G C <dundjoh at googlemail.com>
  • Date: Thu, 13 Oct 2011 03:48:58 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

> Series[(A h) ** (B h), {h, 0, 2}]

... + A B  h^2+O[h]^3

The problem is the appearance of a commutative product A B. It should
instead be A ** B

However applying the D gives the correct answer:

> D[(A h ) ** (B h), {h, 2}]

0**(B h)+2 A**B+(A h)**0



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