Acronym sidtixhipy, pt || sidtixhi Name (degenerate) sidtixhi pyramid Circumradius ∞   i.e. flat in euclidean space Confer general polytopal classes: decomposition

It either can be thought of as a degenerate 5D segmentotope with zero height, or as a 4D euclidean decomposition of the larger base into smaller bits.

As abstract polytope sidtixhipy is isomorphic to gidtixhipy, thereby replacing gike by ike, resp. gikepy by ikepy and sidtixhi by gidtixhi.

Incidence matrix according to Dynkin symbol

```ox3oo3oo3oo5/2*b&#x   → height = 0
(pt || sidtixhi)

o.3o.3o.3o.5/2*b    | 1   * ♦ 120    0 | 1200    0 | 2400   0   0 | 600 120 0
.o3.o3.o3.o5/2*b    | * 120 |   1   20 |   20   60 |   60  20  12 |  20  12 1
--------------------+-------+----------+-----------+--------------+----------
oo3oo3oo3oo5/2*b&#x | 1   1 | 120    * ♦   20    0 |   60   0   0 |  20  12 0
.x .. .. ..         | 0   2 |   * 1200 |    1    6 |    6   3   3 |   3   3 1
--------------------+-------+----------+-----------+--------------+----------
ox .. .. ..     &#x | 1   2 |   2    1 | 1200    * |    6   0   0 |   3   3 0
.x3.o .. ..         | 0   3 |   0    3 |    * 2400 |    1   1   1 |   1   1 1
--------------------+-------+----------+-----------+--------------+----------
ox3oo .. ..     &#x ♦ 1   3 |   3    3 |    3    1 | 2400   *   * |   1   1 0
.x3.o3.o ..         ♦ 0   4 |   0    6 |    0    4 |    * 600   * |   1   0 1
.x3.o .. .o5/2*b    ♦ 0  12 |   0   30 |    0   20 |    *   * 120 |   0   1 1
--------------------+-------+----------+-----------+--------------+----------
ox3oo3oo ..     &#x ♦ 1   4 |   4    6 |    6    4 |    4   1   0 | 600   * *
ox3oo .. oo5/2*b&#x ♦ 1  12 |  12   30 |   30   20 |   20   0   1 |   * 120 *
.x3.o3.o3.o5/2*b    ♦ 0 120 |   0 1200 |    0 2400 |    0 600 120 |   *   * 1
```