User Portlet User Portlet

Discussions
When you closed your notebook without saving did you have another notebook open? Or a Help page? Closing a notebook is not the same as closing a Mathematica Session. If you want to start over then close everything and start a new Session. I just...
You can't use the Attributes function for that purpose. But you can write statements similar to what you have setting the conditions for x to True, Then you can use them as Assumptions in Simplify and similar statements, or in Assuming or in...
Francis, I don't think that my solutions to your examples contain 'pages of extra code' over your presentations in your earlier posting. To me they seem about the same length or maybe even shorter. And they work. In my opinion it's not good practice...
But Global Magnification is going too far for me. How would one just change the Magnification of documentation notebooks?
David, I have a well developed tensor program, Tensorial, that I could share with you. It has all the standard processing of tensor index notation. And I have another solution, which is even better if you are interested in the mathematics of...
You are misunderstanding how Rules work. It would go more like this: expr = -1 + 2 Subscript[\[Lambda], 1]^2 Subscript[\[Lambda], 2]^4 - Subscript[\[Lambda], 1]^4 Subscript[\[Lambda], 2]^8 /. {1 - 2 Subscript[\[Lambda],...
I like Hans Dolhaine's example. He does his calculation entirely in a vector notation. There is an alternative method using differential forms that is somewhat easier to follow. I decided to use Hans' example to illustrate the differential form...
It doesn't help me much. I'm thinking of buying a new computer (but the old one is still working great after 10 years!) Martijn's post makes me worry that a new computer will not completely eliminate the problem. One of the problems with fonts is...
There are a number of issues. Support recommended doing a clean start and changing some options. Even when V12.1 is uninstalled there are features in V12.0 that no longer work, such as creating a new notebook in a folder using the right click context...
Thank you for your reply Jim. Yes, the paper is > Karl Pearson, 'On Lines and Planes of Closest Fit to Systems of Points in Space' > [Philosophical Magazine 2:559-572, 1901] I don't have access to the paper but the situation is this: I'm...