# Colon and letters in sets of numbers

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• #34928
Walker1
Participant

Attached, are examples of sets of numbers with colons used for "such that" (comparison sign) and letters within grouping symbols. Would you be able to tell me if the colon (preceded by a punctuation indicator) should have a space before and after, or if spaces should be omitted as in Rule IV Section 27(9). Also, if you could explain the use of the lettersign within grouping signs. Thank you for you assistance.

Z superscript 3 = {m,n,p) : m,n,p is a member of Z}

R superscript 6 = {(u,v,w,x,y,z) : u,v,w,x,y,z is a member of R}.

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#34939
Lindy Walton
Moderator

You have found a very interesting problem. Our code book and lesson book do not describe a colon being used in this manner. However, as you discovered, example (9) in §27.f does show this use of a colon. Although the colon is not the topic of 27.f, I would go ahead and follow the spacing used there. That is, when a colon means "such that" do not space it (even though it is spaced in print and even though it is described as a sign of comparison).

Regarding the use of the English-letter indicator within grouping signs, §28.a is clear. When an English letters in regular type is in direct contact with both an opening and closing sign of grouping, do not use an ELI. However when the letter is in direct contact with ONLY ONE sign of grouping (opening or closing) imagine that the sign of grouping is not there and then apply the proper rule from either §26 or §27. §26 explains when the ELI must be used; §27 explains when the ELI is not used. There are many examples in these sections which illustrate these rules.

#34940
Lindy Walton
Moderator

Another observation: Your example shows two enclosed lists where the ELI will not be used according to the rules regarding enclosed lists.

Because we are not treating the colon as a sign of comparison in braille, the "m" and the "u" following each colon will need an ELI.

#34943
kdejute
Moderator

I believe the attached file represents a workable transcription of your example that follows the decisions Lindy outlined.

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#37508
kdejute
Moderator

Attached is an updated workable transcription. The ELI is not used when a letter precedes a symbol of comparison; technical material displayed to narrative text is formatted in 3-5; line breaks in an expression that spans multiple braille lines occur in places that allow for logical reading of the content and also reduce the number of lines required for the expression.

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