Ingersoll and Jackson are partners; Kelly, after much negotiation, agreed to join the firm effective February 1. But on January 15, Kelly changed his mind. Meanwhile, however, the other two had already arranged for the local newspaper to run a notice that Kelly was joining the firm. The notice ran on February 1. Kelly did nothing in response. On February 2, Creditor, having seen the newspaper notice, extended credit to the firm. When the firm did not pay, Creditor sought to have Kelly held liable as a partner. Is Kelly liable?