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  2. Cache placement policies - Wikipedia

    en.wikipedia.org/wiki/Cache_placement_policies

    Since each cache block is of size 4 bytes and is 2-way set-associative, the total number of sets in the cache is 256/(4 * 2), which equals 32 sets. Set-Associative Cache. The incoming address to the cache is divided into bits for Offset, Index and Tag. Offset corresponds to the bits used to determine the byte to be accessed from the cache line.

  3. Whitehead theorem - Wikipedia

    en.wikipedia.org/wiki/Whitehead_theorem

    For example, the Warsaw circle, a compact subset of the plane, has all homotopy groups zero, but the map from the Warsaw circle to a single point is not a homotopy equivalence. The study of possible generalizations of Whitehead's theorem to more general spaces is part of the subject of shape theory.

  4. Homology (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Homology_(mathematics)

    For example, the two embedded circles in a figure-eight shape provide examples of one-dimensional cycles, or 1-cycles, and the 2-torus and 2-sphere represent 2-cycles. Cycles form a group under the operation of formal addition, which refers to adding cycles symbolically rather than combining them geometrically.

  5. CW complex - Wikipedia

    en.wikipedia.org/wiki/CW_complex

    Some examples of 1-dimensional CW complexes are: [7] An interval. It can be constructed from two points (x and y), and the 1-dimensional ball B (an interval), such that one endpoint of B is glued to x and the other is glued to y. The two points x and y are the 0-cells; the interior of B is the 1-cell. Alternatively, it can be constructed just ...

  6. Associative property - Wikipedia

    en.wikipedia.org/wiki/Associative_property

    1.000 2 ×2 0 + (1.000 2 ×2 0 + 1.000 2 ×2 4) = 1.000 2 ×2 0 + 1.000 2 ×2 4 = 1.00 0 2 ×2 4 Even though most computers compute with 24 or 53 bits of significand, [ 8 ] this is still an important source of rounding error, and approaches such as the Kahan summation algorithm are ways to minimise the errors.

  7. Universal coefficient theorem - Wikipedia

    en.wikipedia.org/wiki/Universal_coefficient_theorem

    For example, it is common to take to be /, so that coefficients are modulo 2. This becomes straightforward in the absence of 2- torsion in the homology. Quite generally, the result indicates the relationship that holds between the Betti numbers b i {\displaystyle b_{i}} of X {\displaystyle X} and the Betti numbers b i , F {\displaystyle b_{i,F ...

  8. Hochschild homology - Wikipedia

    en.wikipedia.org/wiki/Hochschild_homology

    The examples of Hochschild homology computations can be stratified into a number of distinct cases with fairly general theorems describing the structure of the homology groups and the homology ring () for an associative algebra . For the case of commutative algebras, there are a number of theorems describing the computations over characteristic ...

  9. Chain complex - Wikipedia

    en.wikipedia.org/wiki/Chain_complex

    A chain homotopy offers a way to relate two chain maps that induce the same map on homology groups, even though the maps may be different. Given two chain complexes A and B, and two chain maps f, g : A → B, a chain homotopy is a sequence of homomorphisms h n : A n → B n+1 such that hd A + d B h = f − g. The maps may be written out in a ...