Pyramid 261
Preview $$U_{261}(x, y) = x + \frac{1}{\sqrt{1 - 4 y}}$$
Pyramid 262
Preview $$U_{262}(x, y) = y + \frac{1}{\sqrt{1 - 4 x}}$$
Pyramid 263
Preview $$U_{263}(x, y) = \frac{1}{\sqrt{1 - 4 x} \left(1 - y\right)}$$
Pyramid 264
Preview $$U_{264}(x, y) = \frac{\sqrt{1 - 4 x} - \sqrt{- 4 x - 4 y \sqrt{1 - 4 x} + 1}}{2 y \sqrt{1 - 4 x}}$$
Pyramid 265
Preview $$U_{265}(x, y) = - y + \frac{1}{1 - x}$$
Pyramid 266
Preview $$U_{266}(x, y) = \frac{1 - \sqrt{- 4 x - 4 y^{2} + 1}}{2 x + 2 y^{2}}$$
Pyramid 267
Preview $$U_{267}(x, y) = \frac{1 - \sqrt{- 4 x^{2} - 4 y + 1}}{2 x^{2} + 2 y}$$
Pyramid 268
Preview $$U_{268}(x, y) = \frac{x}{2} + \frac{y}{2} + \frac{\sqrt{x^{2} + 2 x + y^{2} + y \left(2 - 2 x\right) + 1}}{2} + \frac{1}{2}$$
Pyramid 269
Preview $$U_{269}(x, y) = \frac{- 2 x y - 2 y - \sqrt{- 4 x y - 4 y + 1} + 1}{2 y^{2}}$$
Pyramid 270
Preview $$U_{270}(x, y) = \frac{- 2 x y - 2 x - \sqrt{- 4 x y - 4 x + 1} + 1}{2 x^{2}}$$
Pyramid 271
Preview $$U_{271}(x, y) = \left(x + y + 1\right)^{2}$$
Pyramid 272
Preview $$U_{272}(x, y) = x^{2} + x + y^{2}$$
Pyramid 273
Preview $$U_{273}(x, y) = x^{2} + y^{2} + y$$
Pyramid 274
Preview $$U_{274}(x, y) = x^{2} + x + y^{3}$$
Pyramid 275
Preview $$U_{275}(x, y) = x^{3} + y^{2} + y$$
Pyramid 276
Preview $$U_{276}(x, y) = x^{3} + x + y$$
Pyramid 277
Preview $$U_{277}(x, y) = x + y^{3} + y$$
Pyramid 278
Preview $$U_{278}(x, y) = \frac{x^{2} + 1}{1 - y}$$
Pyramid 279
Preview $$U_{279}(x, y) = \frac{y^{2} + 1}{1 - x}$$
Pyramid 280
Preview $$U_{280}(x, y) = \frac{- y - \sqrt{- 4 x^{2} + y^{2} - 2 y + 1} + 1}{2 x^{2}}$$
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