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  2. XNOR gate - Wikipedia

    en.wikipedia.org/wiki/XNOR_gate

    XNOR gates are represented in most TTL and CMOS IC families. The standard 4000 series CMOS IC is the 4077, and the TTL IC is the 74266 (although an open-collector implementation). Both include four independent, two-input, XNOR gates. The (now obsolete) 74S135 implemented four two-input XOR/XNOR gates or two three-input XNOR gates.

  3. Logical equality - Wikipedia

    en.wikipedia.org/wiki/Logical_equality

    Logical equality is an operation on two logical values, typically the values of two propositions, that produces a value of true if and only if both operands are false or both operands are true. The truth table of p EQ q (also written as p = q, p ↔ q, Epq, p ≡ q, or p == q) is as follows: The Venn diagram of A EQ B (red part is true)

  4. Logical equivalence - Wikipedia

    en.wikipedia.org/wiki/Logical_equivalence

    Formulas and are logically equivalent if and only if the statement of their material equivalence is a tautology. [ 2 ] The material equivalence of p {\displaystyle p} and q {\displaystyle q} (often written as p ↔ q {\displaystyle p\leftrightarrow q} ) is itself another statement in the same object language as p {\displaystyle p} and q ...

  5. Logical NOR - Wikipedia

    en.wikipedia.org/wiki/Logical_NOR

    In Boolean logic, logical NOR, [1] non-disjunction, or joint denial [1] is a truth-functional operator which produces a result that is the negation of logical or.That is, a sentence of the form (p NOR q) is true precisely when neither p nor q is true—i.e. when both p and q are false.

  6. Logical biconditional - Wikipedia

    en.wikipedia.org/wiki/Logical_biconditional

    Venn diagram of (true part in red) In logic and mathematics, the logical biconditional, also known as material biconditional or equivalence or biimplication or bientailment, is the logical connective used to conjoin two statements and to form the statement "if and only if" (often abbreviated as "iff " [1]), where is known as the antecedent, and the consequent.

  7. Symmetric Boolean function - Wikipedia

    en.wikipedia.org/wiki/Symmetric_Boolean_function

    Congruence functions: their value is 1 on input vectors with the number of ones congruent to k mod m for fixed k, m; Parity function: their value is 1 if the input vector has odd number of ones; The n-ary versions of AND, OR, XOR, NAND, NOR and XNOR are also symmetric Boolean functions.

  8. Truth table - Wikipedia

    en.wikipedia.org/wiki/Truth_table

    If a compound is built up from n distinct sentence letters, its truth table will have 2 n rows, since there are two ways of assigning T or F to the first letter, and for each of these there will be two ways of assigning T or F to the second, and for each of these there will be two ways of assigning T or F to the third, and so on, giving 2.2.2 ...

  9. NOR gate - Wikipedia

    en.wikipedia.org/wiki/NOR_gate

    The NOR gate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both the inputs to the gate are LOW (0); if one or both input is HIGH (1), a LOW output (0) results.