dihedral angle

Kedlaya, Poonen and two other co-authors proved that exactly 59 isolated examples plus two infinite families of tetrahedra have rational dihedral angles.

In 1995, two of the authors of the new work, Poonen and Rubinstein, actually found what ultimately turned out to be every tetrahedron with rational dihedral angles.

To find the desired ones, with all rational dihedral angles, Conway and Jones said that mathematicians needed to find a special class of solutions to the equation, which would correspond exactly to the rational tetrahedra.

In determining the center of gravity, the bird was frozen in the soaring position, its wings making a dihedral angle of 150.

At this point in Book VI it is customary to introduce the dihedral angle.

The reason is that the flexible covering will be bowed back by the wind, forming an approximate "dihedral angle."

The wings were fixed at a considerable dihedral angle, and the engine was a twenty-four horse-power Antoinette.

But in some machines to-day a modified dihedral angle is used, and with satisfactory results.