Smelting is the process of removing pure metal from its ore by heating the oxidized ore in the presence of a reducing agent such as carbon (coke) and a fluxing agent such as limestone to remove the accompanying rock gangue as slag. The smelting of haematite is shown on the iron page.
This appearance arises from mentally reading the E as an
contrapositive, and not its converse.html">converse by negation.
§ 727. The converse of I is a little difficult to grasp. It becomes
'it may be that.'
§ 728. _Conversion by Contraposition of Complex Propositions._
As applied to conjunctive propositions conversion by contraposition
.'. If C is not-D, A is always not-B.
(O) If A is B, C is sometimes not D.
.'. If a man is untruthful, he is always.
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