Entering a string of variables [UPDATED]

[Rich Shepard]

On Thu, 14 Mar 2024, Rich Shepard wrote:

> How should I enter such strings to not get this error?

I'm reading the math manual and will re-enter this string using command mode
(the former ERT, yes?).

Not since 2005 have I entered complex equations. What size brackets should I
specify for the attached equation? Any and all suggestions on writing that
equation are welcome. :-)

TIA,

Rich
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