# stroke function

<logic> The dyadic truth function "not both". One of only two dyadic truth functions capable of expressing all truth functions by itself. Notation: p|q. Also called the Sheffer stroke, and alternative denial. See dagger function

```	p q   p | q
T T     F
T F     T
F T     T
F F     T

```
A truth-functional connective that suffices to symbolize every dyadic relation between statements. Since " p | q " (or "not both p and q") takes the truth-values illustrated in the {truth-table} at right, negation can be defined as " p | p " and disjunction as " ( p | p ) | ( q | q )". From these, in turn, all of the other connectives can be derived. Recommended Reading: Willard V. O. Quine, Mathematical Logic (Harvard, 1981) and Alfred North Whitehead and Bertrand Arthur Russell, Principia Mathematica to 56 (Cambridge, 1997).

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Nearby terms: strength reduction « strict « strict evaluation « stroke function » strongly connected component » structuralism » structural recursion