Definition:Species

Definition

In a spherical triangle, two angles, two sides, or an angle and a side are of the same species if and only if:

both are between $0 \degrees$ and $90 \degrees$

or:

both are between $90 \degrees$ and $180 \degrees$.

Otherwise they are of opposite species.

Also see

• Results about species can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): species
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): species