establish the truth of

See: confirm, verify
References in classic literature ?
In proof of this we have signed this paper to establish the truth of the facts, lest the moment should arrive when either of the actors in this terrible scene should be accused of premeditated murder or of infringement of the laws of honor.
THE public inquiry into the Grenfell Tower fire disaster may take years to conclude and may never establish the truth of what happened, critics have said.
But 17 officers have died since the 1989 disaster, while seven, none currently serving with the force, turned down the chance to help establish the truth of what happened and the subsequent actions of police.
According to the supporters of the website which had led to the defacing, they are seeking to establish the truth of the September 11, 2001 suicide airliner attacks on New York's Twin Towers.
Labour sought to step up the pressure on the beleaguered Liberal Democrat Cabinet minister, urging Mr Cameron to set up an inquiry to establish the truth of the claims surrounding the eight-year-old speeding offence.
However the papers, released to the National Archives in Kew, west London, suggest that while MI5 continued to pursue the trail of the elusive Lee for more than three years after the war was over, they were never able to establish the truth of the allegations.
Even assuming that the defendant could establish the truth of the Terminella claims, that is not a basis for changing the defendant's sentence," said Assistant U.
It is important to establish the truth of what happened in the past, to take whatever steps are necessary to prevent it from occurring again," he said.
Detectives have been unable to establish the truth of claims in the correspondence which Walton says were fantasy for his gratification, Newcastle Crown Court heard.
Responses to revisionists reflect a natural desire to establish the truth of the Holocaust in the public arena.
To Erdos, however, it wasn't enough to cobble together any old proof to establish the truth of a conjecture.