Q: What is the definition of a polar bear?

[spoiler:3mppczee]A: A rectangular bear after a coordinate transformation[/spoiler:3mppczee]

Q: What is the value of the contour integral around Western Europe?

[spoiler:3mppczee]A: Zero, all the Poles are in Eastern Europe.[/spoiler:3mppczee]

Why did the mathematician name his dog Cauchy?

[spoiler:3mppczee]Because he (the dog not the mathematician) left a residue at every pole.[/spoiler:3mppczee]