Filed by Synopsys, Inc.
                           Pursuant to Rule 425 under the Securities Act of 1933
                                        and deemed filed pursuant to Rule 14a-12
                                          of the Securities Exchange Act of 1934

                                            Subject Company:  Avant! Corporation
                                                     Commission File No. 0-25864



On December 3, 2001, Synopsys, Inc. and Avant! Corporation announced that they
had entered into a merger agreement, which agreement was filed by Synopsys today
under cover of Form 8-K and is incorporated by reference into this filing.

ADDITIONAL INFORMATION

In connection with the proposed merger, Synopsys and Avant! will file a joint
proxy statement/prospectus with the SEC. INVESTORS AND SECURITY HOLDERS ARE
URGED TO READ THE JOINT PROXY STATEMENT / PROSPECTUS REGARDING THE PROPOSED
MERGER WHEN IT BECOMES AVAILABLE, BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION.
Investors and security holders may obtain a free copy of the joint proxy
statement / prospectus (when available) and other related documents filed by
Synopsys and Avant! with the SEC at the SEC's website at www.sec.gov. The joint
proxy statement / prospectus (when it is available) and the other documents may
also be obtained for free by accessing Synopsys' website at www.synopsys.com or
by directing a request by mail or telephone to 700 East Middlefield Road,
Mountain View, CA 94043, Attention: Company Secretary, (650) 584-5000, or by
accessing Avant!'s website at www.avanticorp.com or by directing a request by
mail or telephone to 4671 Bayside Parkway, Fremont, CA 94538, Attention Company
Secretary, (510) 413-8000.

Synopsys, Avant!, and their respective directors, executive officers and certain
other members of management and employees may be soliciting proxies from their
respective stockholders in favor of the merger. Information regarding the
persons who may, under the rules of the SEC, be considered participants in the
solicitation of the Synopsys stockholders, or the Avant! stockholders, as the
case may be, in connection with the proposed merger, will be set forth in the
joint proxy statement / prospectus when it is filed with the SEC.