Definition:Wirth Interval Notation/Historical Note

Historical Note on Wirth Interval Notation
The double-dot convention appears to have originated with during the course of his design of the Pascal programming language. It can be considered as either an incomplete ellipsis: "$\ldots$" or as a colon "$:$" lying on its side: $.\,.$

In of $1989$ by,  and , it is stated that this notation was:
 * suggested by and 

but little corroboration can be found on the Internet to support this.

had in fact adopted the ellipsis notation: $\left({a \ldots b}\right)$ in a $1972$ article:
 * ... we introduce the following notations for open and closed intervals:

While it is left unstated who those others were in the we, it can be noted that is cited in the references, along with,  and.

's contribution appears to be rather more limited. Apart from his $1979$ thesis, in which he expands on the work of and, he appears to have had no active involvement in the invention of this notation, and appears simply to have adopted it.

It is suggested that 's name is attached to this more strongly than is perhaps merited. Note that was a student of 's, and the latter may have shown favouritism when attributing the notation.

Ultimately, evidence is strongly suggestive that the invention of this notation was completely the work of ; the possible attribution to others may be because of their decision to adopt it.