Prosecutors and lawyers for South Africa's jailed former president Jacob Zuma, who has been in hospital since Friday, have jointly asked a judge to postpone his scheduled appearance this week in a corruption trial, his foundation said on Monday. Zuma, whose jailing last month on a contempt of court case led to a wave of looting and unrest, was expected to appear at the Pietermaritzburg High Court on Tuesday in an arms deal corruption case dating from his time as vice president.