BOLYAI (FARKAS), WOLFGANG : Tentamen Juventutem Studiosam in elementa matheseos purae, elementaris ac sublimioris methodo intuitiva evidentiaque huic propria introducendi, cum Appendice triplici. Editio secunda. Tom. 1-2. Bp. 1897-1904. Academiae Scientiarium Hungaricae 1 t. (with engraving of the author) XII. 679 p. XI. t. LXIII. 437 p. +1 page. In total 1136 (plus XII+LXIII) pages. 3rd volume (with figures/diagrams) missing, just Vols. I&II - however rare. Bindings restaured, on front pages some injury (one is smaller, the other one is a bit bigger), but inside very nice, with all parts. Includes XI foldable tables in Vol. II. Major work of the Mathematician Wolfgang de Bolya (father of the more famouf johannes de Bolya, Bolyai János, whose non-euclidic geomatry was a huge step towards modern mthematics, including some aspects of the relativity of Einstein - who was said to know the legacy of Johannes de Bolyai).