Studies of Euler diagrams/examples

dummy


miniri

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Euler diagram (cylindric)
   

This is a filtrate of barita. See here.


A good Euler diagram of this Boolean function needs 3 dimensions.

Euler diagram (cylindric)
   


barogi

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This representation is inflated. The Boolean function is sufficiently represented by the red-yellow Euler diagram (A, D).
The green-blue Venn diagram (B, C) does not add information. But the corresponding circles e.g. in barita are relevant. So are those in the gap variants vidita and vanatu.

Euler diagram
   


bareto

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This is like barogi shown above, but with the additional information, that B and C are complements:      .
This is a 4-ary Boolean function, whose bloatless part is the 2-ary barogi.   (It is a special case, that the arguments of the bloatless and bloat part are disjoint.)


basori

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This representation is also inflated. Only the red-yellow-brown Euler diagram (A, D, E) matters.
The green-blue Venn diagram (B, C) does not add information. But the corresponding circles in basiga are relevant.

Euler diagram
   


barita

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The green-blue (B, C) and brown-magenta (E, F) Venn diagrams would be separate bundles, if they were not trisected by the red-yellow Euler diagram (A, D).
In the graph this is a multiplication, and in the formula it is a conjunction. Compare the filtrates.

Euler diagram and graph
   


basiga

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Without the small bundle (F, G, H) the surrounding one would be just the red-yellow-brown Euler diagram (A, D, E), as in basori.
But as the small bundle is only in B, and not in C, the green and blue circles are also needed.

If the inner bundle were on its own, it would fall apart into the circles F and H. The circle G would just bisect that Boolean function, adding no information. But in the nested bundle, the circle G is relevant. Removing it would mean, that G implicitly bisects the whole Boolean function (including A...E). But actually it bisects only one cell of the surrounding bundle, namely the one where only B and D intersect.

Compare the gap variants and filtrates.

Euler diagram and graph
   


putuki

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Euler diagram (matrix)        graph
   
Compare piferi, where spot 0 is a gap.


dukeli

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This is like putuki without spot 9.   For the NP equivalence class see dukeli NP.   For a conversion example see dukeli and netuno.