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The modular decomposition of countable graphs : Definition and construction in monadic second-order logic

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Academic year: 2021

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Figure

Figure 3. The skeleton of the robust graph G
Figure 5. The leaf representing of x is the first element of the second direction of x, in other words, the second element of the lexicographically first pair (u, v) of leaves for which u ∨ v = x and u < v.
Figure 7. The tree of a linear order N The transduction of Proposition 7.1 is not order-invariant.
Figure 9 shows a tree T and one of its stretchings U . The nodes of T , and their copies in U are indicated by •
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