By Julian Baggini, Richard J. Brown, Antonia Macaro

From Rubik's cubes to Godel's incompleteness theorem, every thing mathematical defined, with color illustrations, in part a minute. Maths is having fun with a resurgence in reputation. So how are you going to stay away from being the one dinner visitor who has no proposal who Fermat was once, or what he proved? The extra you recognize approximately Maths, the fewer of a technology it turns into. 30 moment Maths takes the head 50 most tasty mathematical theories, and explains them to the final reader in part a minute, utilizing not anything greater than pages, two hundred phrases and one photo. learn at your personal velocity, and notice that maths could be extra attention-grabbing than you ever imagined.

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**Additional info for 30-Second Maths: The 50 Most Mind-Expanding Theories in Mathematics, Each Explained in Half a Minute**

**Example text**

Numer. Meth. 1002/fld 2014 H. WU AND Z. 5 X Figure 15. 5: (a) density; (b) velocity; (c) pressure; and (d) internal-energy. results confirm the good behavior of the new two-step splitting Riemann solver in Godunov-type methods and we believe that the solver will do well with other complex EOS. 5. EXTENSION TO TWO-DIMENSIONAL SYSTEM Euler equations in fluid dynamics in two dimensions can be written as follows: *U *F(U ) *G(U ) + + =0 *t *x *y Copyright q 2007 John Wiley & Sons, Ltd. (24) Int. J.

Complete details are presented in the following sections. 2. GOVERNING EQUATIONS The governing equations of one-dimensional unsteady flow in a channel of prismatic rectangular cross-section with a sufficient small bottom slope are the Saint Venant equations. These equations express conservation of mass and momentum. In conservative form, they are as follows: Ut + F(U )x = S U= h hu , F(U ) = hu hu 2 + 12 gh 2 , S= 0 (1) gh(s0 − sf ) where U is the conservative variables vector in which, h and u are flow depth and velocity, respectively; F(U ) the flux vector; S the source term vector, consist of bed slope S0 and friction slope Sf .

Numer. Meth. 1002/fld 2010 H. WU AND Z. SHEN test 1, test 2, test 3 and test 4, respectively. Figure 11 shows the numerical results for the density; local structures of the tests can be seen in Figure 12. All choices can be applied successfully in test 1. Choice (6) failed in test 2, choice (7) failed in test 2, test 3 and test 4, choice (8) and choice (13) can be applied to all tests successfully, choice (9) and choice (12) only failed in test 4. In test 1 choice (9) and choice (12) are the same, in test 2 choice (9) and choice (13) are the same, in test 3 choice (6), choice (8) and choice (12) are the same.