The article doesn't explain what distinguishes a gravitational singularity from a mathematical singularity in GR equations. I put "sometimes" but someone took it away.
Here's the diff: mathematical singularities don't *always* means gravitational singularities because they can be artifacts of the coordinate system used.
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... of hills and (low) mountains to the south, home to most of Brazil's population and its agricultural base. Along the coast of the Atlantic Ocean are also found several ...