Enumeration of polyominoes with fixed perimeter defect. Andrei Asinowski. Gill Barequet, Yufei Zheng
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1 Enumeration of polyominoes with fixed perimeter defect Andrei Asinowski (Vienna University of Technology) Gill Barequet, Yufei Zheng (Technion Israel Institute of Technology)
2 A polyomino is a set of unit cells in the grid, connected via edges.
3 A polyomino is a set of unit cells in the grid, connected via edges. The size of a polyomino is the number of cells.
4 Enumeration of polyominoes with respect to their area is an open problem, widely believed to be difficult.
5 Enumeration of polyominoes with respect to their area is an open problem, widely believed to be difficult. The enumerating sequence (A(n)) n 1 begins with 1, 2, 6, 19, 63, 216, 760,... (A001168).
6 Enumeration of polyominoes with respect to their area is an open problem, widely believed to be difficult. The enumerating sequence (A(n)) n 1 begins with 1, 2, 6, 19, 63, 216, 760,... (A001168). n = 3 2 4
7 Enumeration of polyominoes with respect to their area is an open problem, widely believed to be difficult. The enumerating sequence (A(n)) n 1 begins with 1, 2, 6, 19, 63, 216, 760,... (A001168). Only 56 numbers are known (Jensen); The nature of the generating function is not known; The limit λ := lim A(n + 1)/A(n) exists (Madras); Bounds: λ > (Barequet, Rote, Shalah), λ < (Klarner, Rivest); Conjectured: λ
8 The perimeter p of a polyomino P is the number of empty cells that neighbor at least one cell of P.
9 The perimeter p of a polyomino P is the number of empty cells that neighbor at least one cell of P.
10 The perimeter p of a polyomino P is the number of empty cells that neighbor at least one cell of P.
11 The perimeter p of a polyomino P is the number of empty cells that neighbor at least one cell of P. We denote by A(n, p) the number of polyominoes with area n and perimeter p.
12
13 Observation: For each polyomino of area n, we have p 2n + 2.
14 Observation: For each polyomino of area n, we have p 2n + 2. Proof: Each cell has 4 neighboring grid cells. Each pair of neighboring cells in P yields a loss of 2. There are at least n 1 pairs of neighbors. Therefore, p 4n 2(n 1).
15 Observation: For each polyomino of area n, we have p 2n + 2. Proof: Each cell has 4 neighboring grid cells. Each pair of neighboring cells in P yields a loss of 2. There are at least n 1 pairs of neighbors. Therefore, p 4n 2(n 1). Definition: The (perimeter) defect of P is k := 2n + 2 p.
16 A perimeter cell: a free cell that has an occupied neighbor. An excess of a perimeter cell is the number of occupied neighbors minus 1. The total excess of a polyomino is the sum of excesses over all perimeter cells.
17 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map.
18 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map. n = 14, p = 17, k = 13 e = 5, f = 4
19 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map. n = 14, p = 17, k = 13 e = 5, f = 4 Proof: As above, each cell has 4 neighboring cells. Loss: each free cell excess contributes its excess directly, each edge of a spanning tree contributes 2, each edge closing a cycle contributes 2.
20 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map. n = 14, p = 17, k = 13 e = 5, f = 4 Proof: As above, each cell has 4 neighboring cells. Loss: each free cell excess contributes its excess directly, each edge of a spanning tree contributes 2, each edge closing a cycle contributes 2. p = 4n e 2(n 1) 2f = 2n + 2 e 2f
21 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map n = 14, p = 17, k = 13 e = 5, f = 4 Proof: As above, each cell has 4 neighboring cells. Loss: each free cell excess contributes its excess directly, each edge of a spanning tree contributes 2, each edge closing a cycle contributes 2. p = 4n e 2(n 1) 2f = 2n + 2 e 2f
22 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map n = 14, p = 17, k = 13 e = 5, f = 4 Proof: As above, each cell has 4 neighboring cells. Loss: each free cell excess contributes its excess directly, each edge of a spanning tree contributes 2, each edge closing a cycle contributes 2. p = 4n e 2(n 1) 2f = 2n + 2 e 2f
23 Proposition: For each polyomino, we have k = e + 2f, where e is the total excess, and f is the number of inner faces in the dual map n = 14, p = 17, k = 13 e = 5, f = 4 Proof: As above, each cell has 4 neighboring cells. Loss: each free cell excess contributes its excess directly, each edge of a spanning tree contributes 2, each edge closing a cycle contributes 2. p = 4n e 2(n 1) 2f = 2n + 2 e 2f
24 Small values of k (k = 2n + 2 p, k = e + 2f)
25 Small values of k (k = 2n + 2 p, k = e + 2f) k = 0 e = f = 0 the polyomino is a stick for n 2, we have A(n, 2n + 2) = 1.
26 Small values of k (k = 2n + 2 p, k = e + 2f) k = 0 e = f = 0 the polyomino is a stick for n 2, we have A(n, 2n + 2) = 1. k = 1 e = 1, f = 0 the polyomino is a one-bend path for n 3, we have A(n, 2n + 1) = 4(n 2).
27 k = 2 e = 2, f = 0 or e = 0, f = 1
28 k = 2 e = 2, f = 0 or e = 0, f = 1
29 k = 2 e = 2, f = 0 or e = 0, f = 1 A(n, 2n) = a quadratic polynomial.
30 k = 3: We have 18 patterns, not all of them are polynomial.
31 k = 3: We have 18 patterns, not all of them are polynomial.
32 k = 3: We have 18 patterns, not all of them are polynomial.
33 k = 3: We have 18 patterns, not all of them are polynomial. x 12 (1 x) 2 (1 x 2 ) 2
34 k = 3: We have 18 patterns, not all of them are polynomial. Upon addition of 18 generating functions: (1 x) 4 (1 + x) 2
35 k = 3: We have 18 patterns, not all of them are polynomial. Upon addition of 18 generating functions: A(n, 2n 1) = (1 x) 4 (1 + x) ( 1)n + ( ( 1)n) n 89n n3
36 General fixed k?
37 General fixed k? 1. Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials).
38 General fixed k? Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials). The number of patterns is finite.
39 General fixed k? Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials). The number of patterns is finite. A correct notion of pattern (to ensure partition).
40 We expect that these will be in the same class.
41 What about these?
42 What about these?
43 What about these?
44 What about these?
45 What about these?
46
47
48
49
50
51
52 Vertical cut C: A maximal set of consecutive columns, C i,..., C j, such that for C = {C i 1,..., C j+1 } we have P C = {i 1,..., j + 1} A, where A and a, b A, a b a b 3.
53
54
55
56
57 1/(1 x) 1/(1 x 2 ) 1/(1 x 2 ) 1/(1 x 3 ) 1/(1 x 2 ) 1/(1 x) x 27 (1 x) 2 (1 x 2 ) 3 (1 x 3 )
58 Proposition: The number of pattern classes is finite.
59 Proposition: The number of pattern classes is finite. For the proof, we define three kinds of special cells: 1. Excess cells (perimeter cells with non-zero excess), 2. Bend cells (cells of P with at least one pair of non-opposite occupied neighbors), 3. Leaf cells (degree 1 in the dual).
60 Proposition: The number of pattern classes is finite. For the proof, we define three kinds of special cells: 1. Excess cells (perimeter cells with non-zero excess), 2. Bend cells (cells of P with at least one pair of non-opposite occupied neighbors), 3. Leaf cells (degree 1 in the dual). E L E L B B B B E B L
61 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell.
62 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
63 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
64 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
65 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
66 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
67 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
68 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells... E
69 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells... B
70 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
71 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells... E
72 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
73 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
74 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
75 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells... E
76 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
77 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
78 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells... E
79 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
80 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Suppose that the three columns do not contain special cells...
81 Claim 2: The number of special cells is bounded by a constant.
82 Claim 2: The number of special cells is bounded by a constant. k = e + 2f
83 Claim 2: The number of special cells is bounded by a constant. k = e + 2f 1. Each excess cells contributes directly to e. 2. Each bend cell contributes directly to e or to f. 3. V 1 V V 4 + 2, and each cell of degree 3 or 4 is a bend cell.
84 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Claim 2: The number of special cells is bounded by a constant.
85 Claim 1: If a column that intersects a polyomino does not belong to a cut, then it or at least one of its neighbors contains a special cell. Claim 2: The number of special cells is bounded by a constant. The number of columns that do not belong to a cut, is bounded. All the reduced polyominoes lie in a square of a bounded size. There is a finite number of reduced polyominoes. There is a finite number of patterns classes.
86 1. 2. Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials). The number of patterns is finite.
87 1. 2. Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials). The number of patterns is finite. 3. It remains to sum up the generating functions.
88 1. 2. Each pattern produces a rational generating function (more precisely: its denominator is a product of cyclotomic polynomials). The number of patterns is finite. 3. It remains to sum up the generating functions. For each fiked k, the generating function of (A(n, 2n + 2 k)) n k is rational.
89 The multidimensional case (d-polycubes): The main result is the same.
90 The multidimensional case (d-polycubes): The main result is the same. (The maximum perimeter is 2n(d 1) + 2. In the formula k = e + 2f, f is...)
91 The multidimensional case (d-polycubes): The main result is the same. (The maximum perimeter is 2n(d 1) + 2. In the formula k = e + 2f, f is the circuit rank the number of edges that must be removed from the graph in order to obtain a tree. It is equal to E V + 1.)
92 k CP 0 x 1 1 (x 1) 2 2 (x 1) 3 3 (x 1) 4 (x + 1) 2 4 (x 1) 5 (x + 1) 3 5 (x 1) 6 (x + 1) 4 (x 2 + x + 1)
93
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