By Heinz Hopf, S.S. Chern
Those notes encompass elements: chosen in York 1) Geometry, New 1946, subject matters college Notes Peter Lax. through Differential within the 2) Lectures on Stanford Geometry huge, 1956, Notes J.W. college via grey. are right here without crucial They reproduced switch. Heinz used to be a mathematician who mathema- Hopf well-known vital tical principles and new mathematical instances. within the phenomena via designated the significant suggestion the of a or trouble challenge easiest history is turns into transparent. during this style a crystal Doing geometry frequently lead critical permits this to to - pleasure. Hopf's nice perception procedure for many of the in those notes became the st- thematics, subject matters i'll to say a of extra try out ting-points vital advancements. few. it's transparent from those notes that laid the on Hopf emphasis po- differential many of the leads to gentle vary- hedral geometry. whose is either t1al have knowing geometry polyhedral opposite numbers, works I desire to point out and up to date very important hard. between these of Robert on that is a lot within the Connelly pressure, very spirit R. and in - of those notes (cf. Connelly, Conjectures questions open overseas of Mathematicians, H- of gidity, lawsuits Congress sinki vol. 1, 407-414) 1978, .