Binary operations for homotopy groups with coefficients
نویسندگان
چکیده
منابع مشابه
Binary operations and groups
Example 1.3. The examples are almost too numerous to mention. For example, using +, we have (N,+), (Z,+), (Q,+), (R,+), (C,+), as well as vector space and matrix examples such as (Rn,+) or (Mn,m(R),+). Using subtraction, we have (Z,−), (Q,−), (R,−), (C,−), (Rn,−), (Mn,m(R),−), but not (N,−). For multiplication, we have (N, ·), (Z, ·), (Q, ·), (R, ·), (C, ·). If we define Q∗ = {a ∈ Q : a 6= 0}, ...
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ژورنال
عنوان ژورنال: Science China Mathematics
سال: 2018
ISSN: 1674-7283,1869-1862
DOI: 10.1007/s11425-016-9141-6