The Euler class is the image of under the composition of these maps.
Read more about Euler Class: Properties, Relations To Other Invariants
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“Where justice is denied, where poverty is enforced, where ignorance prevails, and where any one class is made to feel that society is in an organized conspiracy to oppress, rob, and degrade them, neither persons nor property will be safe.”
—Frederick Douglass (c. 1817–1895)