Corp. Code, § 602

(a) Unless otherwise provided in the articles, a majority of the shares entitled to vote, represented in person or by proxy, shall constitute a quorum at a meeting of the shareholders, but in no event shall a quorum consist of less than one-third (or, in the case of a mutual water company, 20 percent) of the shares entitled to vote at the meeting or, except in the case of a close corporation, of more than a majority of the shares entitled to vote at the meeting. Except as provided in subdivision (b), the affirmative vote of a majority of the shares represented and voting at a duly held meeting at which a quorum is present (which shares voting affirmatively also constitute at least a majority of the required quorum) shall be the act of the shareholders, unless the vote of a greater number or voting by classes is required by this division or the articles.

(b) The shareholders present at a duly called or held meeting at which a quorum is present may continue to transact business until adjournment notwithstanding the withdrawal of enough shareholders to leave less than a quorum, if any action taken (other than adjournment) is approved by at least a majority of the shares required to constitute a quorum or, if required by this division or the articles, the vote of a greater number or voting by classes.

(c) In the absence of a quorum, any meeting of shareholders may be adjourned from time to time by the vote of a majority of the shares represented either in person or by proxy, but no other business may be transacted, except as provided in subdivision (b).