Christmas in Nazi Germany was a Christian reinvention of the Germanic god Odin. Accordingly, holiday posters were made to depict Odin as the "Christmas or Solstice man", riding a white charger, sporting a thick grey beard and wearing a slouch hat, carrying a sack full of gifts. Other changes were made to the manger, which was replaced by a Christmas garden containing wooden toy deer and rabbits; Mary and Jesus were also depicted as a blonde mother and child. The Christmas tree was also changed. The traditional names of the tree, "Christbaum" or "Weihnachtsbaum", was renamed in the press as fir tree, light tree
Allen Tannenbaum thesis advisor Heisuke Hironaka at the Harvard University in 1976. Tannenbaum has done research in numerous areas including robust control, computer vision, and biomedical imaging, having almost 500 publications. He pioneered the field of robust control with the solution of the gain margin and phase margin problems using techniques from Nevanlinna–Pick interpolation theory, which was the first H-infinity type control problem solved. Tannenbaum used techniques from elliptic curves to show that the reachability does not imply pole assignability for systems defined over polynomial rings in two or more variables over an arbitrary field. He pioneered the use of partial differential