Edge-5-colourings of the icosahedron

18 distinct colourings are listed here:
"0"     "1"     "2"     "3"     "4"     "5"     "6"
"7"     "8"     "9"     "10"     "11"     "12"     "13"     "14"     "15"     "16"     "17"    

The first seven listed above have mirror symmetry, the last eleven are chiral.

Some relations between them are indicated in this image, in which the letters "MR" refer to their index numbers in this paper.

 

"0"

All rotations of the icosahedron preserve the edge-colouring while permuting the colours.

Swap yellow and black for circuit (1,7,2,9,3,5), shape M, to find "1".

all coloursS
all colour pairsM

Isomorphic to MR29.


"1"

Swap yellow and black for circuit (1,7,2,9,3,5), shape M, to find "0".
Swap red and green for circuit (1,2,3,4,5,6), shape M, to find "2".

R G BS
YD
KL
RG RB GB YKM
RY GY BYG-
RK GK BKG+

Isomorphic to MR28.


"2"

Swap red and green for circuit (1,2,3,4,5,6), shape M, to find "1".
Swap red and black for circuit (1,6,12,7), shape O, to find "3".

R YD
G KL
BS
RG YKM
RB BYG-
RYN-
RK GYO
GB BKG+
GKN+

Isomorphic to MR26.


"3"

Swap red and black for circuit (1,6,12,7), shape O, to find "2".
Swap green and yellow for circuit (3,4,10,9), shape O, to find "4".

R7
GL
BS
YD
K3
RGH-
RBE-
RYJ-
RK GYO
GBG+
GKJ+
BYG-
BKE+
YKH+

Isomorphic to MR22.


"4"

Swap green and yellow for circuit (3,4,10,9), shape O, to find "3".
Swap red and green for circuit (1,2,3,9,8,7), shape P, to find "5".
Swap green and black for circuit (1,2,9,3,5,6), shape N, to find "7".

R7
G3
BS
Y7
K3
RG YKP
RB BYE-
RYN+
RK GYO
GB BKE+
GKN-

Isomorphic to MR25.


"5"

Swap red and green for circuit (1,2,3,9,8,7), shape P, to find "4".
Swap yellow and black for circuit (1,5,3,4,11,6), shape P, to find "6".

R5
G5
BS
Y7
K3
RG YKP
RBL-
RYQ+
RKQ-
GBL+
GYQ+
GKQ-
BYE-
BKE+

Isomorphic to MR18.


"6"

Swap yellow and black for circuit (1,5,3,4,11,6), shape P, to find "5".

R5
G5
BS
Y5
KS
RG RY RK GY GK YKP
BK BKL-
GB BYL+

Isomorphic to MR20.


"7"

Swap green and black for circuit (1,2,9,3,5,6), shape N, to find "4".

R7
GD
BS
Y7
KD
RG RKτ+
RB BYE-
RYN+
GB BKG-
GY YKπ+
GKN-

Isomorphic to MR24 and (with reflection) to MR27.



"8"

Swap yellow and black for (1,5,11,6), shape α, to find "12".

R7
G1
B9
Y7
K1
RGT-
RBS-
RYV+
RKι-
GBW+
GYμ-
GKT-
BYN+
BKζ
YKα+

Isomorphic to MR6 and (with reflection) to MR10.


"9"

Swap red and black for (1,6,12,7), shape X, to find "12".

RD
G1
B9
YD
K9
RGY+
RBα-
RYN-
RKX-
GBW+
GYY+
GKW-
BYβ-
BKσ-
YKX-

Isomorphic to MR7 and (with reflecction) to MR21.


"10"

Swap yellow and black for (1,5,11,6), shape α, to find "11"
Swap red and green for (2,3,1,7,8,9), shape T, to find "12".

R G B9
YD
K5
RG RB GBT-
RY GY BYβ-
RK GK BKδ+
YKα+

Isomorphic to MR16 and (with reflecction) to MR19.


"11"

Swap yellow and black for (1,5,11,6), shape α, to find "10".
Swap red and yellow for (4,5,11,10), shape V, to find "13".

R G B9
Y7
K1
RG RB GBT-
RY BYV-
RK BKζ
GYS-
GKW-
YKα+

Isomorphic to MR15 and (with reflecction) to MR12.


"12"

Swap yellow and black for (1,5,11,6), shape α, to find "8".
Swap red and black for (1,6,12,7), shape X, to find "9".
Swap red and green for (2,3,1,7,8,9), shape T, to find "10".
Swap green and black for (1,3,4,11,5,6), shape θ, to find "14".

R7
G1
B9
YD
K5
RGT-
RBS-
RYJ-
RKX-
GBW+
GYY+
GKθ+
BYβ-
BKδ+
YKα+

Isomorphic to MR5 and (with reflecction) to MR17.


"13"

Swap red and yellow for (4,5,11,10), shape V, to find "11".

R Y3
G B9
K1
RGT+
RBι+
RYV-
RKS+
GBT-
GYμ+
GKW-
BYα-
BKζ
YKV+

Isomorphic to MR13 and (with reflecction) to MR8.


"14"

Swap green and black for (1,3,4,11,5,6), shape θ, to find "12".
Swap yellow and black for (2,7,12,8), shape ϡ, to find "15".

R7
G3
B9
YD
K3
RGφ+
RBS-
RYJ-
RKφ+
GBι+
GYϡ+
GKθ+
BYβ-
BKι+
YKϡ-

Isomorphic to MR14 and (with reflecction) to MR23.


"15"

Swap yellow and black for (2,7,12,8), shape ϡ, to find "14".
Swap blue and black for (1,2,7,6,5,3), shape T, to find "16".

R7
G3
B9
Y7
K9
RGφ+
RBS-
RYV+
RKV-
GBι+
GYζ
GKT+
BYV-
BKT-
YKϡ-

Isomorphic to MR4 and (with reflecction) to MR2.


"16"

Swap blue and black for (1,2,7,6,5,3), shape T, to find "15".
Swap green and black for (3,4,11,5), shape V, to find "17".

R7
G3
B7
Y7
K1
RGφ+
RBV+
RYV+
RKμ-
GBφ-
GYζ
GKV+
BYπ+
BKT-
YKι-

Isomorphic to MR3 and (with reflecction) to MR1.


"17"

Rotations of the icosahedron about the axis through the vertices marked in grey preserve the edge-colouring while permuting the colours.

Swap green and black for (3,4,11,5), shape V, to find "16".

all colours7
RG RK GY BY BKπ+
RB RY GB GK YKV+

WTF

Isomorphic to MR9 and (with reflecction) to MR11.