B:24 “On Parts of Parts and Ascending Continued Fractions”. Centaurus 33 (1990), 293–324. Manuscript of preprint.


Linee larghe. Un'ambiguità geometrica dimenticata. Bollettino di Storia delle Scienze Matematiche 15 (1995), 314. Text of preprint

G:24 The rare traces of constructional procedures in `practical geometries´. Filosofi og Videnskabsteori på Roskilde Universitetscenter. 3. Række: Preprints og Reprints 2006 Nr. 2.


[Review of A. Presas i Puig, Praktische Geometrie und Kosmologie am Beispiel der Architektur. (Algorismus, 27). München: Institut für Geschichte der Naturwissenschaften, 1998]. Mathematical Reviews MR1872989 (2003f:01069).



“Sub‑scientific Mathematics: Undercurrents and Missing Links in the Mathematical Technology of the Hellenistic and Roman World”. Filosofi og videnskabsteori på Roskilde Universitetscenter. 3. Række: Preprints og Reprints 1990 nr. 3. Forthcoming in Aufstieg und Niedergang der römischen Welt, II vol. 37,3 (if that volume should ever happen to appear!). Manuscript.




AWhat Is Mathematics: Perspectives Inspired by Anthropology@, pp. 179B196 in John W. Adams, Patrick Barmby & Alex Mesoudi (eds), The Nature and Development of Mathematics: Cross Disciplinary Perspectives on Cognition, Learning and Culture. London & New York: Routledge, 2017.




APractitioners B School Teachers B `Mathematicians': The Divisions of Pre-Modern Mathematics and Its Actors@, pp. 207B224 in John M. Steele & Mathieu Ossendrijver (eds), Studies on the Ancient Exact Sciences in Honor of Lis Brack-Bernsen. Berlin: Edition Topoi, 2017.