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  2. Euler characteristic - Wikipedia

    en.wikipedia.org/wiki/Euler_characteristic

    Its Euler characteristic is then χ = 1 + (−1) n ; that is, either 0 if n is odd, or 2 if n is even. The n dimensional real projective space is the quotient of the n sphere by the antipodal map. It follows that its Euler characteristic is exactly half that of the corresponding sphere – either 0 or 1.

  3. List of Formula One circuits - Wikipedia

    en.wikipedia.org/wiki/List_of_Formula_One_circuits

    The first World Championship Grand Prix was held in 1950 at Silverstone; since then 77 circuits in total have hosted a Grand Prix.A lot of classic (older) circuits have hosted Grands Prix using different configurations throughout their history: Nürburgring, Spa-Francorchamps, Monza, etc. Taking Nürburgring as an example, the first World Championship race there used the 22.835 km (14.189 mi ...

  4. Riemann–Hurwitz formula - Wikipedia

    en.wikipedia.org/wiki/Riemann–Hurwitz_formula

    Indeed, to obtain this formula, remove disjoint disc neighborhoods of the branch points from S and their preimages in S' so that the restriction of is a covering. Removing a disc from a surface lowers its Euler characteristic by 1 by the formula for connected sum, so we finish by the formula for a non-ramified covering.

  5. Track transition curve - Wikipedia

    en.wikipedia.org/wiki/Track_transition_curve

    The Euler spiral provides the shortest transition subject to a given limit on the rate of change of the track superelevation (i.e. the twist of the track). However, as has been recognized for a long time, it has undesirable dynamic characteristics due to the large (conceptually infinite) roll acceleration and rate of change of centripetal ...

  6. List of motor racing circuits by FIA grade - Wikipedia

    en.wikipedia.org/wiki/List_of_motor_racing...

    There are 38 Grade One circuits with 45 layouts. Circuits holding Grade One certification may host events involving "Automobiles of Groups D (FIA International Formula) and E (Free Formula) with a weight/power ratio of less than 1 kg/hp." [1] As such, a Grade One certification is required to host events involving Formula One cars.

  7. Lizard on track halts Formula 1 practice in Singapore - AOL

    www.aol.com/lizard-track-halts-formula-1...

    A large lizard scampered onto the track and stopped the third and final Formula 1 practice session for the Singapore Grand Prix on Saturday. The session was briefly red-flagged after Aston Martin ...

  8. Planar graph - Wikipedia

    en.wikipedia.org/wiki/Planar_graph

    Repeat until the remaining graph is a tree; trees have v = e + 1 and f = 1, yielding v – e + f = 2, i. e., the Euler characteristic is 2. In a finite, connected , simple , planar graph, any face (except possibly the outer one) is bounded by at least three edges and every edge touches at most two faces, so 3 f <= 2 e ; using Euler's formula ...

  9. Motor racing-Formula One trials AI to tackle track limits ...

    www.aol.com/news/motor-racing-formula-one-trials...

    Formula One's governing body is trialling artificial intelligence (AI) to tackle track limits breaches at this weekend's season-ending Abu Dhabi Grand Prix. The Paris-based FIA said it would be ...