#disproof__falsification__refutation  any evidence that helps to establish the falsity of something
  supertype:  #evidence.situation__grounds  your basis for belief or disbelief; knowledge on which to base belief; "the evidence that smoking causes lung cancer is very compelling"
  subtype:  #reductio_ad_absurdum  (reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proff of a proposition by showing that its negation leads to a contradiction
  subtype:  #confutation  a conclusive refutation
  subtype:  #counterexample  refutation by example

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