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 compat …

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 Co …

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 re …