 # Given that x¹⁵ + 1 = (x + 1)(x²+ x + 1)(x⁴+ x + 1)(x�...

## Question

Given that x¹⁵ + 1 = (x + 1)(x²+ x + 1)(x⁴+ x + 1)(x⁴+ x³+ 1)(x⁴+ x³+ x²+ x + 1), determine:
(a) The number of cyclic codes with block length 15.
(b) The number of (15, 11) cyclic codes.
(c) The generator polynomials for (15, 7) cyclic codes.

## Solution Preview

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Part a)
Each of the 5 factors is irreducible polynomial, so the problem is equivalent with finding the number of divisors. Considering each of the 5 factors as divisors (a, b, c, d, e), we obtain 32 divisors, so there are 32 cyclic codes of block length 15. We also recall that when multiplying two of the factors, the operation is preserved (we also obtain a cyclic code from the product of two or more cyclic codes)...

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