In Oliver Salazar Celis' "Adaptive Thiele interpolation," ACM Communications of Computer Algebra 56(3), Issue 221, September 2022, page 125 (Eq. 1) we find:
What does this horizontal plus vertical division-like notation mean?
2026-05-06 01:18:09.1778030289
Meaning of a novel "division" notation
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It's mentioned in the sentence leading up to the formula:
"...this routine produces a continued fraction of the form..." [source]
On the notation of continued fractions, WolframAlpha has