New corrected versions of Ark2 ¡­

New corrected versions of Ark2 (where there was a mistake in problem 12) and Ark4 ( where there was a mistake in problem 3) are on the web.

There is also a small misprint in theorem 3.4.2 in tom's note, which can be confusing. You find the correction on the list of misprints.

Geir