Can't Remove[] variable "K"? (Really strange behavior . . . )

*To*: mathgroup at smc.vnet.net*Subject*: [mg69131] Can't Remove[] variable "K"? (Really strange behavior . . . )*From*: AES <siegman at stanford.edu>*Date*: Wed, 30 Aug 2006 06:35:23 -0400 (EDT)*Organization*: Stanford University*Sender*: owner-wri-mathgroup at wolfram.com

For years I've started every notebook with the input line x; Remove["Global`*"]; so every calculation will start more or less "fresh". Recently a calculation exhibited weird behavior involving a variable "K", which didn't seem to get removed or cleared by Remove[]. I eventually boiled this down to a simple free-standing 5 Input cell notebook as follows: x; Remove["Global`*"]; K=0.6; Remove["Global`*"]; Remove::"rmnsm" There are no symbols matching "Global`*". More? K 0.6 ??K K is a default generic name for a summation index in a symbolic sum. K = 0.6 Notes: 1) This is on a Mac iBook G4, OS 10.3.9, Mathematica 5.1.0.0. 2) Each single-indent line is an Input cell; double-indent lines are Output cells. Behavior repeats the same after re-typing all the cells into a fresh notebook; after quitting and re-starting Mathematica; after shutting down and restarting the Mac. 3) I appreciate that user variables preferably start with lower case -- but other single-cap-letter symbol names work OK, and doing Help on "K" brings up nothing special associated with K by itself. [And by the way, how can one select a sequence of cells in a notebook and copy all their contents -- including error msgs -- to paste in as above, without having to retype most of the stuff?)

**Follow-Ups**:**Re: Can't Remove[] variable "K"? (Really strange behavior . . . )***From:*"Chris Chiasson" <chris@chiasson.name>

**Re: Can't Remove[] variable "K"? (Really strange behavior . . . )***From:*"Carl K. Woll" <carlw@wolfram.com>