The proxy fight between Yahoo and activist shareholder firm Third Point just got extra nasty.

Third Point came out swinging late Thursday with an allegation that Yahoo CEO Scott Thompson lied about his college degree -- and on Friday, the activist shareholder firm called for Thompson's ouster.

In a series of published biographical statements stretching back for years -- including his bio on Yahoo's website -- Thompson has said that he "holds a Bachelor's degree in accounting and computer science" from Stonehill College.

But his degree is actually only in accounting, a fact Third Point discovered and pointed out in a scathing letter to Yahoo's board of directors.

After the letter was released, Yahoo sent out a statement saying references to Thompson earning a computer science degree were an "inadvertent error."

It's an error Thompson made repeatedly. References to Thompson's nonexistent computer science degree are featured in his bios on sites for PayPal, the eBay subsidiary where he previously served as president.

Stonehill, a small Roman Catholic college in Massachusetts, also confirmed to CNNMoney that Thompson's only degree is in accounting.

Third Point called Yahoo's response "inadequate" in a Friday statement: "To assert that years of inaccurate SEC filings, website biographies and ... were 'inadvertent' is, in our view, the height of arrogance."

Third Point wants the Yahoo board to fire Thompson for cause, and to take three other major actions by noon on Monday: Reveal the vetting process for Thompson's appointment as CEO, explain the process for nominating board directors, and disclose whether any Yahoo board members knew about Thompson's college degree inaccuracy.

Yahoo, which quickly stripped all references to Thompson's degree out of his official bio on Yahoo's website, said the error "in no way alters that fact that Mr. Thompson is a highly qualified executive with a successful track record leading large consumer technology companies."

Yahoo updated its statement late Thursday to add that its board will be reviewing the issue and will, when that probe is completed, "make an appropriate disclosure to shareholders."

Dan Loeb, the CEO of Third Point, has a long history of launching proxy fights -- and Yahoo is the latest company in his crosshairs. In February, Third Point filed paperwork proposing four new Yahoo board members, including Loeb himself.

Yahoo doesn't want to play ball, and Third Point's subsequent proxy letters have been filled with vitriol.

One choice line from Thursday's letter: "We learned that during Mr. Thompson's tenure at Stonehill only one such course was even offered -- Intro to Computer Science. Presumably, Mr. Thompson took that course."  

沪江英语快讯：据外国媒体报道，雅虎激进投资人、Third Point首席执行官丹·勒布（Daniel S. Loeb）与雅虎的斗争一直没有停息。上周四，勒布宣称雅虎首席执行官斯科特·汤普森（Scott Thompson）简历中的文凭描述存在欺诈现象。雅虎发言人已经发布声明，称雅虎在描述汤普森拥有计算机科学的学历方面“犯了粗心大意的错误”，但坚持称汤普森拥有会计学方面的文凭。不过，该发言人还辩驳称，勒布以此为由声称汤普森不适合担任雅虎首席执行官的论断也不合理。