TY - BOOK AU - Helgason,Sigurdur TI - Groups and geometric analysis: integral geometry in variant official differential SN - 9780821826737 U1 - 512.55 H367G PY - 1984/// CY - Rhode Island PB - American Mathematical Society KW - Mathematics KW - Geometric analysis KW - Differential operators KW - Spherical functions KW - Compact symmetric spaces KW - Integral geometry ER -