IFS with Memory

Romes and IFS without memory

rstheta phief
10.50.50 000
20.50.50 00.50.5
30.250.250 00.50
40.250.250 00.750.25
50.250.250 000.5
60.250.250 00.250.75
70.1250.1250 00.250.5
80.1250.1250 00.3750.625
Here are the IFS rules to generate this picture. Denote the whole picture by A.
Click each part of A to see the sequence of edges of the graph that generate that part.
Note the subsquares with addresses 1 and 4 are romes. So for example
T1(A) = T1(T1(A) ∪ T2(A) ∪ T3(A) ∪ T4(A))
because each of the transitions 1 → 1, 1 → 2, 1 → 3, and 1 → 4 is allowed.
That is, the subsquare with address 1 contains a copy of A scaled by 1/2.
Similarly, the subsquare with address 4 contains a copy of A scaled by 1/2.
Because 2 and 3 are not romes, those subsquares do not contain copies of A scaled by 1/2.
Because 1 → 2 and 4 → 2 are the only transitions into subsquare 2, that square contains two copies of A,
    T2(T1(A)) and T2(T4(A)), both scaled by a factor of 1/4.
Finally, the transitions 1 → 3, 4 → 3, and 2 → 3 are allowed, so subsquare 3 contains four copies of A
    T3(T1(A)) and T3(T4(A)), both scaled by a factor of 1/4, and T3(T2(T1(A))) and T3(T2(T4(A))), both scaled by a factor of 1/8.

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