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What do the {z:|z-a|+|z+a|=2c} "where" |...

What do the `{z:|z-a|+|z+a|=2c} "where" |a|lt c` represent?

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`{z:|z-a|+|z+a\=2e}`
`"where " |a|lt`
` Here z is a complex number .
Let `z=x=iy.`
`:.(xy)` is the point corresponding the complex number z.
'a' and '-a' be two fixed points.
`:.`Eqn.(1) implies that the sum of the distancer of the point (x,y) from two points a' and '-a` is constant i.e.2c
`:.` The locat is an ellipse.
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