Table 10 Topological stratification (23) of the LCC \({\mathcal {G}}\) of the Caltech CPN. Each stratum contains topologically equivalent courses, starting with the most fundamental \(({\mathcal {S}}_1)\) and leading to the most advanced \(({\mathcal {S}}_7)\)

\({\mathcal {S}}_1\)

CS 1, Ma 1

\({\mathcal {S}}_2\)

ACM 11, Ch 1, ChE 15, Ma 2

\({\mathcal {S}}_3\)

ACM 104, Bi 8, CS 2, ChE 62, ChE 63, Ge 11 ab, Ma 5, Ph 1

\({\mathcal {S}}_4\)

ACM 95/100, APh 17, Ay 20, Bi 1, Bi 1 x, Bi 9, CDS 131, CMS 107, CMS 122, CS 21, CS 3, Ch 41, ChE 101,

EE 44, EE 55, ESE 101, ESE 102, Ge 106, Ge 114 a, ME 11, ME 12, Ma 108, Ma 121, Ma 3, Ma 6, Ph 12, Ph 2, Ph 3

\({\mathcal {S}}_5\)

ACM 116, Ae 101, Ae 102, Ae 160, Ay 101, Ay 102, Ay 21, Be 103 a, Bi 122, Bi 195, CDS 110, CDS 231, CS 121,

CS 156, CS 171, CS 24, CS 38, Ch 102, Ch 110, Ch 21, Ch 3, ChE 103, ChE 105, EE 111, EE 45, ESE 130, ESE 142,

ESE 166, Ge 114 b, Ge 120 a, ME 13, Ma 109, Ma 120, NB 150, Ph 106, Ph 125, Ph 20, Ph 6

\({\mathcal {S}}_6\)

ACM 101, ACM 106, APh 105, APh 114, APh 115, APh 23, Ae 104, Ae 105, Ae 118, Ay 121, Ay 123, Ay 124, Ay 126,

Ay 127, BE 103 b, CDS 112, CDS 232, CE 108, CMS 117, CMS 144, CMS 155, CNS 187, CS 122, CS 142, CS 143,

CS 174, CS 4, Ch 111, Ch 112, Ch 125, Ch 14, Ch 145, Ch 146, Ch 242, Ch 4, ChE 126, ChE 141, ChE 151, ChE 164,

EE 10, EE 112, EE 151, EE 153, EE 157, EE 160, EE 40, ESE 131, ESE 168, ESE 171, ESE 176, Ge 101, Ge 11 d,

Ge 112, Ge 115 ab, Ge 118, Ge 120 b, Ge 161, Ge 162, IDS 157, ME 119, ME 14, MS 115, MS 116, Ma 110, Ma 130,

Ma 140, Ma 151, Ma 160, Ph 127, Ph 129, Ph 135, Ph 137, Ph 205, Ph 21, Ph 22, Ph 236, Ph 7

\({\mathcal {S}}_7\)

ACM 105, ACM 109, ACM 118, ACM 154, ACM 170, ACM 201, ACM 204, ACM 206, ACM 210, ACM 213, ACM 216,

ACM 217, ACM 256, ACM 257, AM 127, AM 165, APh 112, APh 116, APh 138, APh 156, APh 190, APh 24, APh 256,

Ae 103, Ae 115, Ae 120, Ae 159, Ae 165, Ae 201, Ae 204, Ae 205, Ae 213, Ae 214, Ae 215, Ae 218, Ae 220, Ae 223,

Ae 232, Ae 233, Ae 234, Ae 239, Ae 241, Ae 242, Ae 251, Ae 265, Ay 104, Ay 105, Ay 107, Ay 122, Ay 125, Ay 190,

BE 150, BE 153, BE 159, BE 161, BE 205, BE 25, BMB 170, BMB 174, BMB 178, Bi 10, Bi 114, Bi 116, Bi 117,

Bi 118, Bi 145, Bi 158, Bi 160, Bi 182, Bi 183, Bi 188, Bi 189, Bi 190, Bi 192, Bi 222, Bi 250, CDS 190, CDS 233,

CDS 242, CDS 243, CDS 244, CDS 90, CE 108, CE 112, CE 173, CMS 139, CNS 102, CNS 247, CS 101, CS 11, CS 111,

CS 115, CS 116, CS 12, CS 120, CS 123, CS 124, CS 130, CS 131, CS 132, CS 137, CS 141, CS 145, CS 146, CS 150,

CS 151, CS 152, CS 153, CS 159, CS 162, CS 165, CS 166, CS 176, CS 178, CS 22, Ch 104, Ch 120, Ch 121, Ch 122,

Ch 129, Ch 135, Ch 143, Ch 144, Ch 147, Ch 149, Ch 15, Ch 153, Ch 154, Ch 212, Ch 213, Ch 225, Ch 226, Ch 247,

Ch 25, Ch 251, Ch 5, Ch 6, Ch 8, Ch, 9, ChE 111, ChE 114, ChE 115, ChE 118, ChE 120, ChE 128, ChE 130, ChE 142,

ChE 152, ChE 163, ChE 165, ChE 174, ChE 188, EE 113, EE 114, EE 115, EE 119, EE 121, EE 124, EE 125, EE 126,

EE 127, EE 128, EE 135, EE 136, EE 152, EE 158, EE 161, EE 163, EE 164, EE 167, EE 85, EE 90, EE 91, ESE 132,

ESE 133, ESE 134, ESE 135, ESE 136, ESE 137, ESE 138, ESE 156, ESE 172, ESE 177, Ge 102, Ge 11 c, Ge 115 c,

Ge 116, Ge 117, Ge 121, Ge 122, Ge 124, Ge 125, Ge 136, Ge 137, Ge 139, Ge 143, Ge 149, Ge 150, Ge 155, Ge 163,

Ge 164, Ge 166, Ge 177, Ge 178, Ge 212, Ge 214, Ge 215, Ge 264, Ge 270, IDS 126, IDS 158, ME 115, ME 117,

ME 146, ME 163, ME 174, ME 202, ME 224, ME 23, ME 260, ME 266, ME 40, ME 50, ME 72, MS 121, MS 133,

MS 161, MS 162, MS 166, MS 90, Ma 111, Ma 112, Ma 116, Ma 117, Ma 118, Ma 123, Ma 124, Ma 125, Ma 128,

Ma 132, Ma 135, Ma 142, Ma 145, Ma 147, Ma 157, Ma 162, MedE 243, NB 152, NB 154, NB 155, NB 162, NB 163,

NB 164, NB 220, Ph 105, Ph 118, Ph 136, Ph 139, Ph 177, Ph 199, Ph 203, Ph 219, Ph 223, Ph 229, Ph 230, Ph 232,

Ph 235, Ph 237, Ph 250, Ph 5, Ph 50, Ph 77, Ph 8