**Principle of contradiction** — In logic, the Principle of contradiction ( principium contradictionis in Latin) is the second of the so called three classic laws of thought. The oldest statement of the law is that contradictory statements cannot both at the same time be true, e … Wikipedia

**Principle of bivalence** — In logic, the semantic principle of bivalence states that every proposition takes exactly one of two truth values (e.g. truth or falsehood ). The laws of bivalence, excluded middle, and non contradiction are related, but they refer to the… … Wikipedia

**Non-Aristotelian logic** — The term non Aristotelian logic, sometimes shortened to null A, means any non classical system of logic which rejects one of Aristotle s premises (see term logic). Contents 1 History 2 Use in science fiction 3 See also 4 … Wikipedia

**Non-Euclidean geometry** — Behavior of lines with a common perpendicular in each of the three types of geometry Non Euclidean geometry is the term used to refer to two specific geometries which are, loosely speaking, obtained by negating the Euclidean parallel postulate,… … Wikipedia

**Contradiction** — In classical logic, a contradiction consists of a logical incompatibility between two or more propositions. It occurs when the propositions, taken together, yield two conclusions which form the logical, usually opposite inversions of each other.… … Wikipedia

**Non-standard cosmology** — Physical cosmology Universe · Big Bang … Wikipedia

**Non-topological soliton** — In quantum field theory, a non topological soliton (NTS) is a field configuration possessing, contrary to a topological one, a conserved Noether charge and stable against transformation into usual particles of this field for the following reason … Wikipedia

**List of philosophy topics (I-Q)** — II and thou I Ching I Ching I proposition I Thou I Thou relationshipIaIamblichus (philosopher)IbYahya Ibn Adi Yahya Ibn Adi Ibn al Arabi Muhyi al Din Ibn al Arabi Abu Bakr Ibn Bajja Abu Bakr Ibn Bājja Abu Bakr Muhammad Ibn Yahya Ibn as Say igh… … Wikipedia

**List of topics in logic** — This is a list of topics in logic.See also: List of mathematical logic topicsAlphabetical listAAbacus logic Abduction (logic) Abductive validation Affine logic Affirming the antecedent Affirming the consequent Antecedent Antinomy Argument form… … Wikipedia

**Criticism of Wikipedia** — Wikipedia is the largest free content encyclopedia project written by volunteers, as a result of which, it has attracted criticism. Notable criticisms include that its open nature makes it unauthoritative and unreliable (see Reliability of… … Wikipedia