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In the notation, variables are ambiguous in denotation, preserve a recognizable identity appearing in various places in logical statements within a given context, and have a range of possible determination between any two variables which is the same or different. When the possible determination is
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the same for both variables, then one implies the other; otherwise, the possible determination of one given to the other produces a meaningless phrase. The alphabetic symbol set for variables includes the lower and upper case Roman letters as well as many from the Greek alphabet.
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are also used to show groupings of functions of propositions. In the above example, the dot before the final implication function symbol groups all of the previous functions on that line together as the antecedent to the final consequent.
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50:"The notation adopted in the present work is based upon that of Peano, and the following explanations are to some extent modelled on those which he prefixes to his
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as complex functions of propositions, using the equals sign "=" to separate the defined term from its symbolic definition, ending with the letters "Df".
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The implicative function applied to two ordered propositions returns the truth value of the first implying the second proposition.
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An asserted proposition is either true or an error on the part of the writer.
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The contradictory function applied to a proposition returns its negation.
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The logical sum applied to two propositions returns their disjunction.
54:." (Chapter I: Preliminary Explanations of Ideas and Notations, page 4)
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is same as the making of a statement between two full stops.
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The logical product applied to two propositions returns the
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Russell, Bertrand and Alfred North
Whitehead (1910).
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32:'s logical notation to the logical notions of
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391:{\displaystyle p\cdot p\supset q.\supset q}
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305:{\displaystyle p\supset q\cdot q\supset p}
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72:The four fundamental functions are the
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