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anaphase
One of several stages of cell division. In mitosis the chromatids of each chromosome move apart to opposite ends of the spindle. In the first anaphase of meiosis, the paired homologous chromosomes ...
aneuploid
Describing a nucleus, cell, or organism in which one or more chromosomes have been added to or deleted from the complete set, so that the total number of chromosomes is not an exact multiple of the ...
confectionery fallacy
The confectionery fallacy (so named by Ray Jennings) is found mainly (and frequently) in elementary logic texts whose authors are desperate for a convincing example of an ‘exclusive “or”’ (either ...
conjunction
If p and q are statements, then the statement ‘p and q’, denoted by p ∧ q, is the conjunction of p and q. For example, if p is ‘It is raining’ and q is ‘It is Monday’, then p ∧ q is ‘It is raining ...
dilemma
A situation in which a difficult choice has to be made between two or more alternatives, especially ones that are equally undesirable (see also on the horns of a dilemma). The word is recorded from ...
disjunct
Applied to the distribution of populations that have distinct ranges separated from one another by a distance large enough to ensure DNA cannot be exchanged between them. Compare conjunct.
disjunction Reference library
Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)
the separation of chromosomes at anaphase during nuclear division.
disjunction Reference library
Ruth Barcan Marcus
The Oxford Companion to Philosophy (2 ed.)
A proposition (P or Q), where P and Q are propositions, is a disjunction. In English ‘or’is ambiguous; especially as between an inclusive use, i.e. (...
disjunctive concept
A concept defined by a disjunction (2) specifying the possession of either one attribute or another, for example, a figure that is either red or is a square. Compare conjunctive concept.
dyad
In genetics, one of the products of the disjunction of the tetrads at the first meiotic division, contained in the nuclei of secondary oocytes and spermatocytes.
inclusive disjunction
If p and q are statements, then the statement ‘p or q’, denoted by p ∨ q, is the disjunction of p and q. For example, if p is ‘It is raining’ and q is ‘It is Monday’ then p ∨ q is ‘It is raining or ...
logical sum
The logical sum of two propositions p, q is their disjunction, p ∨ q. The logical sum of two sets is their union.
or
p or q, commonly written p ⁄ q, is that proposition that is true unless both p and q are false. It is sometimes called inclusive disjunction, since it is true when both p and q are true. It is ...
predicate calculus
A fundamental notation for representing and reasoning with logical statements. It extends propositional calculus by introducing the quantifiers, and by allowing predicates and functions of any number ...
propositional calculus
A system of symbolic logic, designed to study propositions. A proposition is a statement that is true or false. There are many alternative but equivalent definitions of propositional calculus, one of ...
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