Headaches are one effect that can come from inhalation of isopropyl alcohol. Isopropyl alcohol, or rubbing alcohol, is often used in the home or in medical facilities to treat various conditions or to sterilize instruments and skin. However, if isopropyl alcohol is inhaled there can be serious side effects.
1a) Definition of contradiction: A contradiction exists any time a proposition P is asserted to be true in conjunction with its negation, not-P. 1b) Definition of conjunction: A conjunction is a connective that joins two propositions.
3. (Logic) logic. 1  a. (of a formal theory) not so constructed that the addition of a non-theorem to the axioms renders it inconsistent. 2  b. (of an expression) not having a reference of its own but requiring completion by another expression.