Google owns 14 percent of Anthropic, an A.I. start-up, according to court documents obtained in an antitrust case.The investment gives Google little control, with no voting rights, board seats, or observer rights at Anthropic.Google plans to invest an additional $750 million in Anthropic through convertible debt, bringing its total investment to over $3 billion.Google, Amazon, and Microsoft have invested in high-profile A.I. start-ups in the race for A.I. dominance.