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# single scalable brackets (bra-ket) [closed]

Dear all,

I am a bit lost on how to split the bra ket operator langle <?> mline <?> rangle . I am aware of the manual which says:

For scaled brackets use none as the bracket name

a = left ( a over b right none newline left none phantom {a over b} + c right )

[...]

Be sure to put spaces (gaps) between elements when entering them directly in the Commands window. This ensures that the correct structure is recognized.

therefore to represent this

I used the followings

iℏ d over {dt} none mline ψ(r ,t) rangle  = H none mline ψ( r ,t) rangle


and

iℏ d over {dt} phantom mline ψ(r ,t) rangle  = H phantom mline ψ( r ,t) rangle


but the results are both wrong because these are not brackets in the sense intended from the manual. How can I proceed?

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### Closed for the following reason the question is answered, right answer was accepted by Alex Kemp close date 2021-05-22 11:46:51.152260

1
( 2021-03-12 22:18:41 +0200 )edit

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It seem to be that left none is the key.

Give a try to

iℏ d over {dt} left none mline ψ(r ,t) right rangle  = H left none mline ψ( r ,t) right rangle


Tested with LibreOffice 6.4.7.2 (x86); OS: Windows 6.1.

Check the mark () to the left of the answer that solves your question.

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Yes, it works in the 7.1 version too! The only remark is that the angular bracket looks different (i.e. vertically stretched and therefore "less angular").

( 2021-03-12 19:17:02 +0200 )edit

Use iℏ d over {dt} left lline ψ(r ,t) right rangle = H left lline ψ( r ,t) right rangle

left xxx and right yyy must occur in pairs.

EDIT 1 The appearance of the brackets can be slightly improved with:

iℏ d over {dt} \ lline ψ(r ,t) \ rangle = H \ lline ψ( r ,t) \ rangle

i.e. you replace left and right with \.

This turns the brackets into non-scalable ones. This may be an inconvenience in some contexts.

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It works, thank you! Same remark as the other solution: the quality of the brackets is different (worse) compare to langle <?> mline <?> rangle

( 2021-03-12 19:28:13 +0200 )edit
1

Don't know how it works, but \ seem better than my proposal.

( 2021-03-12 21:05:50 +0200 )edit
2

It is an escape mechanism. The bracket/parenthesis code after it is no longer considered a must-be-paired bracket but an ordinary character. Since it is no longer scaled vertically, the angle is better looking. But you must also escape the other parenthesis otherwise it is orphaned and you get an error.

( 2021-03-12 21:22:00 +0200 )edit