Homology vs Null - What's the difference?
homology | null |
A homologous relationship.
(biology) A correspondence of structures in two life forms with a common evolutionary origin, such as flippers and hands.
(chemistry) The relationship between the elements in the same group of the periodic table, or between organic compounds in a homologous series.
(topology) A theory associating a system of groups to each topological space.
(algebra) A certain system of groups associated to a chain complex.
(genetics) The presence of the same series of bases in related genes.
A non-existent or empty value or set of values.
Zero]] quantity of [[expression, expressions; nothing.
Something that has no force or meaning.
(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
(computing) the attribute of an entity that has no valid value.
One of the beads in nulled work.
(statistics) null hypothesis
Having no validity, "null and void"
insignificant
* 1924 , Marcel Proust, Within a Budding Grove :
absent or non-existent
(mathematics) of the null set
(mathematics) of or comprising a value of precisely zero
(genetics, of a mutation) causing a complete loss of gene function, amorphic.
As nouns the difference between homology and null
is that homology is a homologous relationship while null is zero, nil; the cardinal number before einn.homology
English
(wikipedia homology)Noun
(homologies)Usage notes
* * (biology) For a discussion of the use of the term (term) (and by association (homologous)) in biology, see: Patterson, Colin. "Homology in Classical and Molecular Biology." Molecular Biology and Evolution 5, no. 6 (November 1988): 603–625. http://mbe.oxfordjournals.org/cgi/reprint/5/6/603.pdf (accessed 18 December 2009; archived 18 December 2009, http://www.webcitation.org/5m7rn4rCe ) * (mathematics) When used attributively before the name of a topological space, as in "homology n -sphere" or "homology manifold", the reference is to a space whose homology is the same as that of the space mentioned: an homology manifold, for example, is a space whose homology is that of some manifold.Derived terms
* cohomology * microhomologynull
English
Noun
(en noun)- (Francis Bacon)
- Since no date of birth was entered for the patient, his age is null .
Adjective
(en adjective)- In proportion as we descend the social scale our snobbishness fastens on to mere nothings which are perhaps no more null than the distinctions observed by the aristocracy, but, being more obscure, more peculiar to the individual, take us more by surprise.