[1] It is awarded jointly by the Academy and the Crafoord Foundation in Lund, with the former selecting the laureates.
[2] The Prize is awarded in four categories: mathematics and astronomy, geosciences, biosciences (with an emphasis on ecology) and polyarthritis,[1] the final one because Holger suffered from severe rheumatoid arthritis in his later years.
[1] Since 2012, the prizes in astronomy and mathematics are separate and awarded at the same time; prior to this, the disciplines alternated every cycle.
[2] A Crafoord Prize in polyarthritis is only awarded when a special committee decides that substantial progress in the field has been made.
[2] The inaugural laureates, Vladimir Arnold and Louis Nirenberg, were awarded the prize in 1982 for their work in the field of non-linear differential equations.