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• s  necessarily or demonstrably true
  demonstrable truths
• s  capable of being demonstrated or proved
  a demonstrable lack of concern for the general welfare

• Where masks do make a demonstrable difference is in the health-care setting, protecting caregivers from sick patients both in hospitals and at home and a national shortage .
• Weeks is convinced that demonstrable eccentricity should be a required trait for America's leaders in order to keep them happy, creative and sane.
• In fact, many mental illnesses even those like schizophrenia that have demonstrable genetic origins can be stopped or at least contained before they start.

• incontrovertible
• provable

News & Articles

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• San Mateo County Civil Grand Jury says keep waste board as is
  Switching the county’s solid waste board from senior city staff members to elected officials has no demonstrable advantage, according to the civil grand jury which also concluded in the same report that customers aren’t that informed about the agency overseeing their garbage and recycling services.
  June 18, 2013 - San Mateo Daily Journal

Quotes

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• Charles Dunstone in Retail Digital
  Charles Dunstone, CEO of The Carphone Warehouse, said, "Best Buy brings demonstrable expertise in merchandising, sourcing and customer service: that should help us accelerate the evolution of our business towards the broader connectivity market. We...
• Paul Keating in The Age
  The recent series of government packages, notwithstanding their scale and speed, has had little demonstrable effect on the level of confidence or the outlook for ongoing activity,Mr Keating writes.
• Achim Steiner in Taipei Times
  Under the program, CN Net will integrate countries, cities and companies all over the world to boost a green economy and "assist in building confidence through demonstrable action at the national and local level on the art of the possible," said...