# introduction

## key words definitions

Parts of the parameter plane

• shrub
• wake
• limb
• Misiurewicz point
• tip (point) = end point = branch tip = the tip of the spoke = terminal point of the branche[1] = tip of the midget[2] "A point in the Mandelbrot Set that is at the end of a filament (as opposed to a branch point); a point from which there is only one path to other points in the Mandelbrot Set."
• The first tip = ftip
• the last tip = ltip

## notation

• find Misiurewicz point
• preperiod and period
• c value
• find angles of external ray that land on it

# algorithms

## Pastor

"the external argument can be calculated as the limit of the arguments of the structural components of the branches 1, 11, 111,..., with periods 4, 5, 6,..., that is, the limit of .(0011), .(00111), .(001111),..., or the limit of .(0100), .(01000), .(010000), .... Hence, ftip(1/3) = .00(1) = .01(0), that are two equal values. " [3]

## Claude

Method by Claude

Steps of the algorithm:

• find angles of the wake
• find angles of principal Misiurewicz point M
• find angles of spoke's tips using: "The tip of each spoke is the longest matching prefix of neighbouring angles, with 1 appended"

### 1/3

3 angles landing on M:

0.001(010)
0.001(100)
0.010(001)

The tip of each spoke is the longest matching prefix of neighbouring angles, with 1 appended

0.001(010) // 9/56 = 0.160(714285)
0.0011    // ltip = 3/16 = 0.1875
0.001(100) // 11/56 = 0.196(428571)
0.01  // ftip = 1/4 = 0.25
0.010(001) // 15/56 = 0.267(857142)

Check with program Mandel :

The angle  3/16  or  0011 has  preperiod = 4  and  period = 1. Entropy: e^h = 2^B = λ = 1.59898328
The corresponding parameter ray lands at a Misiurewicz point of preperiod 4 and period dividing 1.
Do you want to draw the ray and to shift c to the landing point?
c = -0.017187977338350  +1.037652343793215 i    period = 0
The angle  1/4  or  01 has  preperiod = 2  and  period = 1.
Entropy: e^h = 2^B = λ = 1.69562077
The corresponding parameter ray lands at a Misiurewicz point of preperiod 2 and period dividing 1.
Do you want to draw the ray and to shift c to the landing point?
M_{2,1) = c = -0.228155493653962  +1.115142508039937 i

The angle  1/6  or  0p01 has  preperiod = 1  and  period = 2.
The corresponding parameter ray lands at a Misiurewicz point of preperiod 1 and period dividing 2.
Do you want to draw the ray and to shift c to the landing point?
c = -0.000000000000000  +1.000000000000000 i    period = 10000

# examples

## 1/2

${\displaystyle {\begin{cases}0.(s_{-})=0.(01)={\frac {1}{3}}=0.(3)=wake\\0.s_{-}(s_{+})=0.01(10)={\frac {5}{12}}=0.41(6)=PrincipalMis=M_{2,2}\\0.01={\frac {1}{2}}=0.5=tip=M_{1,1}=c=-2\\0.s_{+}(s_{-})=0.10(01)={\frac {7}{12}}=0.58(3)=PrincipalMis=M_{2,2}\\0.(s_{+})=0.(10)={\frac {2}{3}}=0.(6)=wake\\\end{cases}}}$