Euler Class

The Euler class is the image of under the composition of these maps.

Read more about Euler Class:  Properties, Relations To Other Invariants

Famous quotes containing the word class:

    “I do not deny that there may be other well-founded causes for the hatred which various classes feel toward politicians, but the main one seems to me that politicians are symbols of the fact that every class must take every other class into account.”
    —José Ortega Y Gasset (1883–1955)