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The more important logical relations are implication (as in the first example above) and equivalence; and, as displayed in the square of opposition (see opposition, square of), contrariety (as in the second example), contradiction, subcontrariety, and subimplication.
The logical relations holding between propositions and their converses, often pictured graphically in a square of opposition, are as follows: E and I propositions are equivalent or equipollent to their simple converses (i.e., Eba and Iba are the same as Eab and Iab, respectively).
(See traditional square of opposition).
(See entry The Traditional Square of Opposition).
See also the entry on the Traditional Square of Opposition.
(For further discussion of this point, see the entry on the square of opposition).
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For a detailed account of these differences, and of squares of opposition generated by various generalized quantifiers, see Westerståhl (2011).
The construction of Aristotelian squares of opposition and their combination to Aristotelian cubes in systems of consequential implication is considered in Pizzi 2008.
Whether the Pearl Monument's destruction — coming after the rout in the square and arrests of opposition figures — represented a definitive death blow for the protest movement was unclear.
Tahrir Square was the focus of opposition and got the attention of the world for a week, and may end up being the stage for the end of absolutism in Egypt, but to make predictions beyond that with an absolute certainty is just foolish.
Zaydi added that there have been no serious fights among tribesmen in the square, while there have been brawls involving members of opposition political parties.
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