For example, a comparative study of results before and after the defeat by Brazil could provide experts with incontrovertible proof of whether there is a "feel-good" factor involved in exam performance.

BBC: A game of two halves

What this means is rather than trying to catch every cheater you randomly sample for cheating and if you find incontrovertible proof then you impose a punishment so viciously harsh that fear of it deters all possible cheaters.

FORBES: The Sins of the Father: Dishonor, Disgrace and Boiling Cheaters in Oil

To overturn such an impression would require overwhelming and incontrovertible evidence, not vague recriminations from a few former employees.

FORBES: Masha Gessen Is A Heroic Opposition Journalist, Not a Kremlin Stooge

But whatever it is, one fact remains incontrovertible, the people of Hartlepool chose a man in a monkey suit to be their new mayor.

BBC: News | BREAKFAST WITH FROST | Interview with Robin Cook MP, leader of the House of Commons

This solid, stunning and serious exhibition of the work of the great Finnish architect, "Alvar Aalto: Between Humanism and Materialism" (up through May 26), delivers a clear, timeless and incontrovertible message: These are some of the most original and beautiful buildings of our time.

WSJ: Finnish Master Alvar Aalto | By Ada Louise Huxtable

' In the APS it is OK to discuss whether the mass of the proton changes over time and how a multi-universe behaves, but the evidence of global warming is incontrovertible?

WSJ: Sixteen Concerned Scientists: No Need to Panic About Global Warming

And it is simply incontrovertible that the only viable approach to comprehensive deficit reduction, viable both economically and certainly politically, is a balanced approach.

WHITEHOUSE: Press Briefing

But of course if incontrovertible evidence were ever found that Mr Murdoch knew of or authorised the wrongdoing, well that would be a career-ending moment or worse.

BBC: James Murdoch 'knows nothing'