00698nam a2200217Ia 4500003000400000005001700004006001800021007000300039008004100042024001000083037001100093040001800104041001300122100002700135110008500162245009600247260000900343650001600352700002700368700008500395OSt20220930073206.0a|||||r|||| 00| 0ta220926b        |||||||| |||| 00| 0 eng d  a28578  cTheses  aCRLcCRLbeng  2engaeng  aTripathi Satya Prakash  aUniversity of Delhi. Faculty of Mathematical Sciences. Department of Mathematics 0aCohomology algebra of orbit spaces under free actions and hopficity of the ploynomial rings  c1999  aMATHEMATICS  a Tej Bahadur Singh Gu.  aUniversity of Delhi. Faculty of Mathematical Sciences. Department of Mathematics