creating dirac bra-ket notations in Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg72261] creating dirac bra-ket notations in Mathematica*From*: "CIHAN NADIR KAPLAN" <CIKAPLAN at ku.edu.tr>*Date*: Sun, 17 Dec 2006 06:20:02 -0500 (EST)

Hi, I'm using Mathematica 5.0 on WinXP and trying to create dirac bra-ket notations in Mathematica, according to the instructions in the document: http://documents.wolfram.com/v5/Demos/Notebooks/NewNotations.html In the document, the line "In[53]:=" works well, but I want that a number and operator commutes just like at the line In[65]:=. Even though I enter the commands in "In[57]" and "In[59]" , numbers and operators don't commute, and this leads to non-acting operators when there is a number between a ket and the operator. Is there something missing in "In[57]" and "In[59]", or is there an alternative, compact way to get noncommutative behaviour (noncommutativemultiply gives error when using with In[40] ) ? By the way, should I set a different preference from edit->preferences in order to make the commands in the document fully functional? (e.g. when I write Ket[\psi] and call a function, there is no problem, but when I try to input in the bra-ket notation like |psi> using aliases defined here, it gives errors like Syntax::sntxi: Incomplete expression; more input is needed ) Nevertheless, I have succesfully come to In[56], but the inputs after [56] are troublesome. Any help will be greatly appreciated. Regards Nadir

**Follow-Ups**:**Re: creating dirac bra-ket notations in Mathematica***From:*"Chris Chiasson" <chris@chiasson.name>