| Such a consequence will constitute the key step in a proof by reductio ad absurdum, a proof that will culminate in a type of contraposition, turning on modus tollens. |
| They are all remarkable for harmonies attained by certain combinations of shade in gradations with colours in contraposition. |
| Now if this weak form of contraposition holds, then necessary and sufficient conditions can be regarded as converses after all. |
| However, there is a flaw in Austin's argument, arising from its dependence on contraposition. |
| A further process, known as contraposition or Conversion by Negation, consists of conversion following on obversion. |
| It is usually used in contraposition to the term mixes which refers to the combination of a number of vitamins to a certain specification. |
