- Spider diagram
A

**spider diagram**adds existential points to an Euler or aVenn diagram . The points indicate the existence of an attribute described by the intersection of contours in theEuler diagram . These points may be joined together forming a shape like aspider . These represent an OR condition, also known as alogical disjunction .In the image shown, the following conjunctions are apparent from the Euler diagram.

: $A\; land\; B$: $B\; land\; C$: $F\; land\; E$: $G\; land\; F$

In the

universe of discourse defined by thisEuler diagram , in addition to the conjunctions specified above, all possible sets from "A" through "B" and "D" through "G" are availableseparately. The set "C" is only available as a subset of "B". Often, in complicated diagrams,singleton set s and/or conjunctions may be obscured by other set combinations.The two spiders in the example correspond to the following logical expressions:

Red spider:$(F\; land\; E)\; lor\; (G)\; lor\; (D)$

Blue spider:$(A)\; lor\; (C\; land\; B)\; lor\; (F)$

**Applications**Spider diagrams are not widely accepted mathematical tools within either the UK or the US Fact|date=July 2007.

They may be related to UML or OCL (there are a few publications detailing the software based applications of spider diagrams – though UML is held as being far more widely accepted and is already an industry standard for the purposes of aiding software modelling).

Mathematicians with what might be termed a traditional mathematical background do not study the body of knowledge associated with Spider Diagrams (perhaps out of intellectual predjudice - or just a genuine desire to know that mathematics which has found various forms of practical application and wide recognition?).

To some mathematicians at least, it is difficult to see how spider diagrams could be likened in mathematical validity or applicability to algebraic topology, combinatorics, partial differential equations or, indeed, other widely accepted branches of mathematical study which have already found tried and tested practical applications within the wider world - and, as such, are intensely studied despite being well-established.

There are no textbooks that relate to spider diagram based research and it is not widely taught to undergraduates within either the US or the UK Fact|date=January 2008.

Several papers have been published within the area of Spider diagrams. At least one mathematician has questioned the validity of this area of mathematical research Fact|date=July 2007.

**References****Further reading*** Stapleton, G. and Howse, J. and Taylor, J. and Thompson, S. "What can spider diagrams say" Proc. Diagrams, (2004) v. 168, pgs 169-219 Accessed on May 17, 2007 [

*http://www.cmis.brighton.ac.uk/research/vmg/papers/LMSSpiders.pdf here*]**External links*** [

*http://www.cs.kent.ac.uk/events/conf/2004/euler/eulerdiagrams.html Brighton and Kent University - Euler Diagrams*]

*Wikimedia Foundation.
2010.*

### Look at other dictionaries:

**Spider taxonomy**— is the alpha taxonomy of the spiders, members of the Araneae order of the arthropod class Arachnida with about 40,000 described species. However there are likely many species that have escaped the human eye to this day, and many specimens stored… … Wikipedia**Diagram**— Further information: Chart Sample flowchart representing the decision process to add a new article to Wikipedia. A diagram is a two dimensional geometric symbolic representation of information according to some visualization technique. Sometimes … Wikipedia**Venn diagram**— Venn diagrams or set diagrams are diagrams that show all hypothetically possible logical relations between a finite collection of sets (groups of things). Venn diagrams were invented around 1880 by John Venn. They are used in many fields,… … Wikipedia**Grotrian diagram**— A Grotrian diagram or term diagram shows the allowed transitions between the energy levels of atoms. They can be used for one electron and multi electron atoms. They take into account the specific selection rules related to changes in angular… … Wikipedia**Mind map**— A hand drawn mind map A mind map is a diagram used to represent words, ideas, tasks, or other items linked to and arranged around a central key word or idea. Especially in British English, the terms spidergram and spidergraph are more common,[1]… … Wikipedia**List of mathematics articles (S)**— NOTOC S S duality S matrix S plane S transform S unit S.O.S. Mathematics SA subgroup Saccheri quadrilateral Sacks spiral Sacred geometry Saddle node bifurcation Saddle point Saddle surface Sadleirian Professor of Pure Mathematics Safe prime Safe… … Wikipedia**Liberal welfare reforms**— The Liberal welfare reforms (1906 1914 [http://www.bbc.co.uk/schools/gcsebitesize/history/mwh/britain/liberalreformsrev1.shtml BBC GCSE Bitesize History | Modern World History | Britain 1905 1951 | The Liberal reforms 1906 1914 ] ] ) collectively … Wikipedia**Design Quality Indicator**— The Design Quality Indicator (DQI) is a toolkit to measure the design quality of buildings. Development of DQI was started by the Construction Industry Council in 1999[1] and the toolkit was launched as an online resource for the UK construction… … Wikipedia**spidergram**— noun A spider diagram … Wiktionary**Globular cluster**— s from the Sun and contains hundreds of thousands of stars. [cite news coauthors =The Hubble Heritage team url = http://hubblesite.org/newscenter/newsdesk/archive/releases/1999/26/ title = Hubble Images a Swarm of Ancient Stars work = HubbleSite… … Wikipedia