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Can you find the numbers ABC...

Can you find the numbers ABCD so that the following calculation is proved? (ABCD x 4 = DCBA)

Correct answers: 50

The first user who solved this task is aysan saidie.

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Guess Who Knows The State Capitals?

A dumb blonde was bragging about her knowledge of the state capitals of the United States. She proudly announced, "go ahead, ask me any of the capitals, I know all of them."
A red head said, "O.K., what's the capital of Wyoming?" The blonde replied, "Oh, that's easy, 'W'."

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Luigi Cremona

Died 10 Jun 1903 at age 72 (born 7 Dec 1830).Antonio Luigi Gaudenzio Giuseppe Cremona was an Italian mathematician who was an originator of graphical statics (the use of graphical methods to study forces in equilibrium) and work in projective geometry. Cremona's work in statics is of great importance and he gave, in a clearer form, some theorems due to Maxwell. In a paper of 1872 Cremona took an idea of Maxwell's on forces in frame structures that had appeared in an engineering journal in 1867 and interpreted Maxwell's notion of reciprocal figures as duality in projective 3-space. These reciprocal figures, for example, have three forces in equilibrium in one figure represented by a triangle while in the reciprocal figure they are represented by three concurrent lines.

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