Acronym hedip
Name heptagonal-heptagonal duoprism
  ©  
Circumradius 1/(sqrt(2)*sin(π/7)) = 1.629715
General of army (is itself convex)
Colonel of regiment (is itself locally convex)
Dihedral angles
  • at {7} between hep and hep:   180° 5/7 = 128.571429°
  • at {4} between hep and hep:   90°
Confer
general duoprisms:
n,n-dip   n,m-dip  
general polytopal classes:
noble polytopes  

Incidence matrix according to Dynkin symbol

x7o x7o

. . . . | 49 |  2  2 | 1  4 1 | 2 2
--------+----+-------+--------+----
x . . . |  2 | 49  * | 1  2 0 | 2 1
. . x . |  2 |  * 49 | 0  2 1 | 1 2
--------+----+-------+--------+----
x7o . . |  7 |  7  0 | 7  * * | 2 0
x . x . |  4 |  2  2 | * 49 * | 1 1
. . x7o |  7 |  0  7 | *  * 7 | 0 2
--------+----+-------+--------+----
x6o x .  14 | 14  7 | 2  7 0 | 7 *
x . x6o  14 |  7 14 | 0  7 2 | * 7
or
. . . .    | 49 |  4 |  2  4 |  4
-----------+----+----+-------+---
x . . .  & |  2 | 98 |  1  2 |  3
-----------+----+----+-------+---
x7o . .  & |  7 |  7 | 14  * |  2
x . x .    |  4 |  4 |  * 49 |  2
-----------+----+----+-------+---
x7o x .  &  14 | 21 |  2  7 | 14

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