Proper Superset

See also

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More things to try:

• area inside x^2 - 2xy + 4y^2 = 4
• circle of radius 2 with center (0,-2)
• mirror transformation matrix

Cite this as:

Weisstein, Eric W. "Proper Superset." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ProperSuperset.html

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