Pyramid 241
Preview $$U_{241}(x, y) = \frac{x}{\left(1 - x\right)^{3}} + \frac{y}{\left(1 - x\right)^{2}}$$
Pyramid 242
Preview $$U_{242}(x, y) = x^{2} + y^{2}$$
Pyramid 243
Preview $$U_{243}(x, y) = \frac{x^{2} + y^{2}}{1 - x}$$
Pyramid 244
Preview $$U_{244}(x, y) = \frac{1}{- x^{2} - y^{2} + 1}$$
Pyramid 245
Preview $$U_{245}(x, y) = \frac{x^{2} + y^{2}}{1 - y}$$
Pyramid 246
Preview $$U_{246}(x, y) = \frac{- \sqrt{- 4 x^{2} y^{2} + 4 x^{2} + 1} - 1}{2 y^{2} - 2}$$
Pyramid 247
Preview $$U_{247}(x, y) = x + y^{2}$$
Pyramid 248
Preview $$U_{248}(x, y) = x^{2} + y$$
Pyramid 249
Preview $$U_{249}(x, y) = \frac{1}{- x - y^{2} + 1}$$
Pyramid 250
Preview $$U_{250}(x, y) = \frac{1}{- x^{2} - y + 1}$$
Pyramid 251
Preview $$U_{251}(x, y) = \frac{- y^{2} - \sqrt{- 4 x + y^{4} - 2 y^{2} + 1} + 1}{2 x}$$
Pyramid 252
Preview $$U_{252}(x, y) = \frac{- x^{2} - \sqrt{x^{4} - 2 x^{2} - 4 y + 1} + 1}{2 y}$$
Pyramid 253
Preview $$U_{253}(x, y) = \frac{1}{\sqrt{- 4 x^{2} - 4 y^{2} + 1}}$$
Pyramid 254
Preview $$U_{254}(x, y) = \frac{1}{\sqrt{- 4 x - 4 y^{2} + 1}}$$
Pyramid 255
Preview $$U_{255}(x, y) = \frac{1}{\sqrt{- 4 x^{2} - 4 y + 1}}$$
Pyramid 256
Preview $$U_{256}(x, y) = y + \frac{1 - \sqrt{1 - 4 x}}{2 x}$$
Pyramid 257
Preview $$U_{257}(x, y) = \frac{- \sqrt{1 - 4 x} + \sqrt{2} \sqrt{8 x^{2} y - 2 x - \sqrt{1 - 4 x} + 1} + 1}{4 x}$$
Pyramid 258
Preview $$U_{258}(x, y) = \frac{2 x y - y - \sqrt{- 4 x y + y^{2} + 2 y + 1} - 1}{2 x - 2}$$
Pyramid 259
Preview $$U_{259}(x, y) = x + \frac{- 2 y - \sqrt{1 - 4 y} + 1}{2 y^{2}}$$
Pyramid 260
Preview $$U_{260}(x, y) = \frac{- 2 y - \sqrt{1 - 4 y} + 1}{y^{2} \left(2 - 2 x\right)}$$
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