But absence of evidence is even less likely to prove the existence of a threat.
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To date, both the Israeli government and AIPAC have denied the existence of a partisan divide.
The theory predicts the existence of a new particle, which also carries Prof Higgs' name.
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Another archaeologist, RK Sharma, said the motifs found "proved the existence of a 7th century Shiva temple".
China denies the existence of a military plan, but Chinese officials have declined to comment in detail.
And the existence of a coach requires an acknowledgment that even expert practitioners have significant room for improvement.
The existence of a contract specifying that workers are not employees but independent contractors is not always determinative.
Failing to report income or disclose the existence of a foreign account on a tax return is serious.
The structure of the currency and monetary instruments declaration regime, hinges on the existence of a physical object.
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Those cases held that knowledge of the existence of a patent being infringed is needed to prove a violation.
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"I do not believe in the existence of a European people, " he says.
For example, in most cases the existence of a strong successor management team increases the value of the business.
The existence of a magnetic field on Ganymede, the biggest moon of Jupiter.
Perhaps the existence of a fund makes it easier to monitor the liability and to make needed adjustments accordingly?
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The existence of a contractual relationship or beneficial business relationship between two parties.
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If anyone doubted the existence of a billionaire boys' club in Latin America, they got some proof in late May.
Subsequent Spanish historians, intrigued by the existence of a fountain of youth in the New World, kept the story going.
He disagrees with Dr Sinclair over the existence of a regulatory pathway for longevity in which sirtuins play a key role.
It's also referred to as 47, XXX syndrome because of the existence of a 47th chromosome, which is the extra X chromosome.
If their interpretation is correct, that would be exciting, as it would establish the existence of a new class of matter.
Take note, we are not saying the existence of a central bank lifeline via a printing press is something to be desired.
Recent economic research has supported the existence of a link by emphasising the role of human capital in promoting growth and innovation.
The existence of a universal biometric identifier in one field might create irresistible temptations to pull together separate collections of personal information.
Indeed, the existence of a secondary market implies that demand outstrips supply.
What about the existence of a learned language, or a literary language?
This one example does not prove the existence of a systematic problem.
The visit to Benedict is important, correspondents say, as the existence of a living retired pope has prompted fears of a possible rival power.
The existence of a drug that prevents tumors from forming is a major incentive for women to find out if they have such a gene.
The existence of a permanent committee proposing rules about what governments can and cannot do is a complication most prime ministers could happily do without.
Until recently, broadcasters steadfastly denied the existence of a spectrum crunch.
WSJ: Should Some of Broadcasters' Spectrum Be Auctioned Off to Wireless Carriers?
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