However, there are signs that from 1866 he began to read more and more mathematics and the library records in the University of Christiania show clearly that his interests were steadily turning in that direction.
Siiski on märke, et alates 1866 hakkas ta lugeda rohkem matemaatika ja raamatukogu arvestust Ülikooli Christiania näitavad selgelt, et tema huvid olid pidevalt keerates selles suunas.