Definitions for "D'Alembert"
( Betting Progression System for Winning at Blackjack where the bettor raises the bet one unit after each loss and lowers the bet one unit after each win. A series of numbers equidistant from one another is established, such as 1, 2, 3, 4. The player starts out by betting 1 unit. If he wins, he continues to bet one unit. If he loses, he cancels out the 1 and moves to the 2 and adds one unit to the last number, now having a series of 2, 3, 4, 5. At any point in the series where the player wins his bet, he reduces his bet by one unit. If he wins enough bets to return to a one unit bet, he starts over. If he loses during the series, he cancels out the last number he played and adds another number to the series. This system, like all progressions cannot win in any game with a negative expectation..
A betting progression. The bettor raises the bet one unit after each loss and lowers the bet one unit after each win. A series of equidistant numbers such as 1, 2, 3, 4 is established. The player bets 1 unit. If he wins, he continues to bet one unit. If he loses, he cancels out the 1 and moves to the 2. Now the series of numbers is 2, 3, 4, 5. When the player wins his bet, he reduces it by one unit. If he wins enough bets, he can return to a one-unit bet and start over. When he loses, he cancels out the last number he played and tacks on another number to the series. There are many variations to this system, though none have been proven to win and in fact cannot win in any game with a negative expectation.
D'Alembert is a large lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It is located to the northeast of the Campbell walled plain, a somewhat smaller formation. Laying astride the southwest rim of D'Alembert is the Slipher crater.