Hyphen vs. Dash
When a concept is named after the names of two or more people, then the correct way to indicate this is with DASH:
- Pell–Lucas numbers
- Cauchy–Bunyakovsky–Schwarz inequality
When a concept is named after the name of one person with a double-barrelled surname, then the correct way to indicate this is with HYPHEN:
- Mittag-Leffler function
- Morgan-Voyce polynomials
When a concept contains a parameter in the name, the correct way to indicate it is with HYPHEN and ITALICS on the parameter:
- k-Pell numbers
- k-Pell–Lucas numbers
Decimal separator vs. Thousands separator
Being an international journal, and to avoid confusions, NNTDM follows international conventions and standards. The SI metric advises the following:
- Thousands separator is NON-BREAKABLE SPACE (not point or comma).
- In Latex, use the symbol ~ ,
- In MS Word, use the key combination: Ctrl+Shift+Space .
- Decimal separator is POINT (not comma).
Bottom line vs. Midline horizontal ellipsis
Mathematical texts often contain bottom line and midline horizontal ellipses, more widely known for the Latex users as \ldots and \cdots , respectively, or the Unicode symbols in Word … and ⋯ .
The distinction between them is subtle: \ldots aligns the ellipsis with the bottom of the text while \cdots centers the ellipsis. Typographical style considerations dictate which of the two commands to use:
- For lists, use \ldots (…) . Example:
- For matrices and binary operations, use \cdots (⋯) . Example:
In addition, matrices further may require the use of a vertical ellipsis and a diagonal (downward-sloped, down-right) ellipsis, denoted respectively by \vdots (⋮) and \ddots (⋱) .