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Explicit expression for the generating function counting Gessel's walks

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Academic year: 2021

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Figure

Figure 2: The curves X([y 1 (z), y 2 (z)], z) and Y ([x 1 (z), x 2 (z)], z)
Figure 3: The curve X([y 1 (z), y 2 (z)], z) and the new contour of integration C(ǫ, z) Let G C(ǫ, z) be the connected component of C \C(ǫ, z) which does not contain x 3 (z)
Figure 4: The parallelogram [0, ω] ˆ × [−ˇ ω/(2ı), ω/(2ı)] ˇ
Figure 5: Location of the important cycles on the surface [0, ω 2 [×[0, ω 1 /ı[

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