00301nam a2200121 a 450000500170000002000150001708200190003210000180005124500260006926000260009530000210012149000370014220251203110112.0  a0486657795  a516.4,D,Yalb_  aYale, Paul B.  aGeometry and symmetry  aNew YorkbDoverc1988  axi,288p.c23 cm.  aHolder-Day series in mathematics