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RegionErosion

RegionErosion[reg,r] gives the erosion of the region reg by a disk of radius r centered at the origin.

RegionErosion[reg1,reg2] gives the erosion of the region reg1 by the region reg2.

RegionErosion[reg1,reg2,{u,v}] gives the erosion of reg1 scaled by a factor u and reg2 scaled by a factor v.

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