Problem between CAS mode and HOME mode, VARS A,... Z

[compsystems]

but the internal code would show expressions with double letters, which look very bad, whereas with an underscore they don't look so bad.

Code:

A_ = 2 * pi * R_^2

=>

A = 2 * pi * R^2

whereas

Code:

AA = 2 * pi * RR^2