What is the best known result concerning the existence of companion forms for classical modular forms? Gross' tameness criterion paper is always mentioned with a "unchecked compatibility" caveat? ...
My Friends, Shocking as this sounds, I believe to have found a typo in Griffiths & Harris. In the chapter on surfaces, section Rational Surfaces 1, I am trying to read the result that a ...
There are two books by Matsumura on commutative algebra. The earlier one is called Commutative Algebra and is frequently cited in Hartshorne. The more recent version is called Commutative Ring ...