A Whitney umbrella is a self-intersecting rectangle in three dimensions, expressed by the equation: ...

rectangle to see why this map deserves to be called an umbrella....Whitney Umbrella " from The Wolfram Demonstrations Project...

A pinch point , also known as a Whitney singularity or a branch point , occurs at the top endpoint of the...whimsically-named geometrical object first studied by Hassler Whitney in the 1940s....

Amazon.com seeks to be Earth's most customer-centric company, where customers can find and discover anything they might

Amazon.com seeks to be Earth's most customer-centric company, where customers can find and discover anything they might

‹ Back to the main Whitney Design Sunline Energy-Saver Umbrella Dryer page...You are reviewing the Whitney Design Sunline Energy-Saver Umbrella Dryer...

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Storage » Whitney Design 1600 12-line Outdoor Umbrella-Style Clothes Dryer with Aluminum Arms...Features: • Umbrella-style clothes dryer opens and closes easily • 12 vinyl-coated lines provide 165 feet...

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Umbrella Clothes Dryer Clothesline Economy Aluminum @ 165ft by Whitney Design...Outdoor Umbrella Clothes Dryer Clothesline - Legacy 4 Arm Extruded...Outdoor Umbrella Clothes Dryer Clothesline - Superspin 4 Arm Aluminum @170ft by...

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Whitney Willard Straight , Grand Prix motor racing driver, aviator, businessman...Whitney National Bank , which has branches in Louisiana, Mississippi, Alabama, ...Whitney (Pokémon) , a Gym Leader in the Pokémon series...

and the Whitney umbrella x 2 =y 2 z (right)....

three coordinates gives a cross-cap with two pinch points (Whitney umbrella points)....

conical edge , and Whitney umbrella . Define (2) (3) (4) (5) (6) and , , as are the roots of (7) Also define (8) Then the following table enumerates the 17 quadrics and

ling=constrained); The Whitney umbrella. The Whitney umbrella. > gr10 := plot3d([u*v,u,v^2],u=-10..10,v=-10..10,axes=boxed,orientation=[100,80],shading=xy,style=patch,labels=[x,y,z]): > display3d(gr10);