In reference to that point:<br/><br/><div class="quoteheader"><div class="topslice_quote">Quote from: The SrD: Wizards: School Specialization</div></div><blockquote class="bbc_standard_quote">The wizard must choose whether to specialize and, if she does so, choose her specialty at 1st level. At this time, she must also give up two other schools of magic (unless she chooses to specialize in divination; see below), which become her prohibited schools. <br/><br/>A wizard can never give up divination to fulfill this requirement. <br/><br/></blockquote><div class="quotefooter"><div class="botslice_quote"></div></div><br/>There are some prestige classes with their own special rules (Wizard of High Sorcery, Incantatrix) that require additional forbidden schools, but such requires that particular prestige class to be in your build to take advantage of the ability. Otherwise the PHB trumps as primary source, and it says 'no'.