idea inheritance in er diagram and specialization generalization 75 inheritance er diagram.
lovely inheritance in er diagram or 42 inheritance er diagram.
inheritance in er diagram and er diagram notation 11 inheritance er diagram.
fresh inheritance in er diagram or subclass and 22 multiple inheritance in er diagram.
elegant inheritance in er diagram and enter image description here 43 multiple inheritance in er diagram.
luxury inheritance in er diagram and model inheritance in databases 53 er diagram inheritance example.
good inheritance in er diagram for diagram showing multiple inheritance a 58 inheritance er diagram.
good inheritance in er diagram for generalization in er model 88 er diagram inheritance example.
ideas inheritance in er diagram for full disjoint partial disjoint 79 multiple inheritance in er diagram.
new inheritance in er diagram for a specialization lattice with multiple inheritance for a university database 22 er diagram inheritance example.
idea inheritance in er diagram for limitations of entity relationship model 37 multiple inheritance in er diagram.
inspirational inheritance in er diagram and crow foot notation enhanced er diagram 46 multiple inheritance in er diagram.
ideas inheritance in er diagram for inheritance in er model 42 inheritance er diagram.
unique inheritance in er diagram for table per subclass 98 multiple inheritance in er diagram.
beautiful inheritance in er diagram for specialization generalization lattice example university 79 inheritance er diagram.
elegant inheritance in er diagram for 83 inheritance er diagram.
beautiful inheritance in er diagram for 88 er diagram inheritance example.
inspirational inheritance in er diagram and multiple inheritance 94 er diagram inheritance example.
ideas inheritance in er diagram and subclass attribute inheritance 71 er diagram inheritance example.
lovely inheritance in er diagram or inheritance page 36 er diagram inheritance example.
amazing inheritance in er diagram and inheritance 67 multiple inheritance in er diagram.
new inheritance in er diagram and specialization generalization lattice example university 64 multiple inheritance in er diagram.
Usage for Venn diagrams has evolved somewhat since their inception. Both Euler and Venn diagrams were used to logically and visually frame a philosophical concept, taking phrases such as some of x is y, all of y is z and condensing that information into a diagram that can be summarized at a glance. They are used in, and indeed were formed as an extension of, set theory - a branch of mathematical logic that can describe objects relations through algebraic equation. Now the Venn diagram is so ubiquitous and well ingrained a concept that you can see its use far outside mathematical confines. The form is so recognizable that it can shown through mediums such as advertising or news broadcast and the meaning will immediately be understood. They are used extensively in teaching environments - their generic functionality can apply to any subject and focus on my facet of it. Whether creating a business presentation, collating marketing data, or just visualizing a strategic concept, the Venn diagram is a quick, functional, and effective way of exploring logical relationships within a context.
The structure of this humble diagram was formally developed by the mathematician John Venn, but its roots go back as far as the 13th Century, and includes many stages of evolution dictated by a number of noted logicians and philosophers. The earliest indications of similar diagram theory came from the writer Ramon Llull, whos initial work would later inspire the German polymath Leibnez. Leibnez was exploring early ideas regarding computational sciences and diagrammatic reasoning, using a style of diagram that would eventually be formalized by another famous mathematician. This was Leonhard Euler, the creator of the Euler diagram.
Logician John Venn developed the Venn diagram in complement to Eulers concept. His diagram rules were more rigid than Eulers - each set must show its connection with all other sets within the union, even if no objects fall into this category. This is why Venn diagrams often only contain 2 or 3 sets, any more and the diagram can lose its symmetry and become overly complex. Venn made allowances for this by trading circles for ellipses and arcs, ensuring all connections are accounted for whilst maintaining the aesthetic of the diagram.
Euler diagrams are similar to Venn diagrams, in that both compare distinct sets using logical connections. Where they differ is that a Venn diagram is bound to show every possible intersection between sets, whether objects fall into that class or not; a Euler diagram only shows actually possible intersections within the given context. Sets can exist entirely within another, termed as a subset, or as a separate circle on the page without any connections - this is known as a disjoint. Furthering the example outlined previously, if a new set was introduced - birds - this would be shown as a circle entirely within the confines of the mammals set (but not overlapping sea life). A fourth set of trees would be a disjoint - a circle without any connections or intersections.
A Venn diagram, sometimes referred to as a set diagram, is a diagramming style used to show all the possible logical relations between a finite amount of sets. In mathematical terms, a set is a collection of distinct objects gathered together into a group, which can then itself be termed as a single object. Venn diagrams represent these objects on a page as circles or ellipses, and their placement in relation to each other describes the relationships between them. Commonly a Venn diagram will compare two sets with each other. In such a case, two circles will be used to represent the two sets, and they are placed on the page in such a way as that there is an overlap between them. This overlap, known as the intersection, represents the connection between sets - if for example the sets are mammals and sea life, then the intersection will be marine mammals, e.g. dolphins or whales. Each set is taken to contain every instance possible of its class; everything outside the union of sets (union is the term for the combined scope of all sets and intersections) is implicitly not any of those things - not a mammal, does not live underwater, etc.
Other Collections of Inheritance In Er Diagram