By Karl Heinrich Hofmann

ISBN-10: 0387068074

ISBN-13: 9780387068077

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**Extra resources for The Pontryagin duality of compact 0-dimensional semilattices and its applications**

**Example text**

To illustrate some of the features of MACSYMA programs, we define the Hessian using a program block. A block in MACSYMA is similar to a subroutine in FORTRAN, or a procedure in ALGOL or PLII. A block contains local variables that 29 will not conflict with variables having the same names outside or global to the block. For example, in (Cll the atomic variables DFXX ... DFZZ are locally assigned the values of the various mixed second partial derivatives. We then compute the determinant and simplify it through the RATSIMP and FACTOR commands within the block statement.

2050048 X + 549120 X - 84480 X + 6600 X 2 - 200 X + 1 We now find the same (correct) expression for the 20th polynomial in 1122 the CPU time. One can generate many examples where careful programming can save orders of magnitude of processing time. real applications will be shown later. 31 5. Special Purpose Packages There are special purpose packages in MACSYMA for use in General Relativity, high energy physics and several other fields of study. These auxiliary packages often provide features that are useful to non-specialists.

If you count the terms, after expanding out (D2), you will fmd 70. This explains why it is so tricky to correctly evaluate the integral by hand. INTEGRATE; Time= 10488 msec. 3 4 2 (02) N (K LOG(N) - 2 N + 3 N + B) 3 2 3 2 + 2 N (3 N - 4 N - 2 K) (K LOG(N) - 2 N + 3 N + B) + N (1080 N - 2940 N 6 5 + 3 4 2016 N - 1575 K N + 3 2 2240 K N 2 + 840 K ) 3 2 2 (K LOG(N) - 2 N + 3 N + B) 170 + 9 8 7 6 6 N (272160 N - 1125600 N + 1561140 N - 631800 K N - 725760 N + 5 4 2 3 2 2 1808100 K N - 1298304 K N + 694575 K N - 1019200 K N 3 3 2 - 352800 K ) (K LOG(N) - 2 N + 3 N + B)/14700 42 3 4 9 2 N (42768 N - 237952 N + 498966 N - 467181 N + 164736) + --------------------------------------------------------- 5005 7 3 2 K N (2437776 N - 10510000 N + 15149673 N - 7299072) 88200 2 5 2 K N (23996250 N - 70529375 N + 51894528) + ----------~-------------------------------- 514500 3 3 5 K N (1377 N - 2048) 4 - ----------------------- + 24 K N 144 Actually, the researcher needed the FORTRAN expression for the integral in (02).

### The Pontryagin duality of compact 0-dimensional semilattices and its applications by Karl Heinrich Hofmann

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