susceptible of proof

See: provable
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References in classic literature ?
You must use,' said the gentleman, 'for all these purposes, combinations and modifications (in primary colours) of mathematical figures which are susceptible of proof and demonstration.
Pledger was apparently the only person other than Dodds who was able to testify to his alibi, making her testimony material, not cumulative, and not susceptible of proof by other means,'' Zelon wrote.
communicates no factual proposition susceptible of proof or refutation.