离散数学作业代写 MACM 201代写 D100 AND D200代写
1523MACM 201 - D100 AND D200 ASSIGNMENT #8 离散数学作业代写 Instructions Answer all questions on paper or a tablet using your own handwriting. Put your name, student ID number and page number at th...
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数学线性代数代写 Remarks: A) Definition is just a definition, there is no need to justify or explain it. B) Answers to questions with proofs should be written
A) Definition is just a definition, there is no need to justify or explain it.
B) Answers to questions with proofs should be written in the following format:
i) Statement and/or Result.
ii) Main points that will appear in your proof.
iii) The actual proof.
C) Answers to questions with computations should be written in the following format:
i) Statement and/or Result.
ii) Main points that will appear in your computation.
iii) The actual computation.
(a) Define the field C, namely write how its elements look like, and how to multiply any two complex numbers.
(b) Fix an integer n ≥ 1. Write down the standard formula for all complex numbers z ∊ C, that satisfy
zn = 1. (1)
(c) If you think on C as the plane R2 , and draw there the points z that solve the equation (1), an connect any two adjacent points by a line, you obtain a configuration called n-gon, denoted Gn. Draw the n-gon Gn; for n = 3,4,5.
(a) Do the following:
1. Write down the definition of a vector space V over a field F.
2. Suppose V is a vector space over a field F. Define when a subset B ⊂ V is called basis of V .
3. Define when a vector space V over a field F is finite-dimensional, and, in this case, define its dimension.
(c) Recall what is the finite field F2 with two elements (i.e., write down its elements and the addition and multiplication table). Now, suppose n is a non-negative integer, and V is a vector space of dimension n over the field F2. How many elements V has? Explain your answer.
(a) Suppose V and W are vector spaces over a field F. Define when a map
T : V → W,
is called linear transformation.
(b) Suppose V is an n-dimensional vector space over a field F, and B = {v1, …, vn} is a basis of V . In addition, suppose T : V → V, is a linear transformation. Denote by Mn = Mn(F) the set of n × n matrices with entries from F.
(a) Define what is an inner product〈,〉 on V . In this case the pair (V,〈,〉) is called inner product space.
(b) Suppose that V is finite dimensional, with inner product 〈,〉. Suppose W ⊂ V is a subspace. The subspace of V given by,
W⊥ = {v ∊ V ; 〈v , w〉 = 0, for every w ∊ W},
is called the orthogonal complement of W. Do the following:
1. dim(W) + dim(W⊥) = dim(V ):
2. For two subspaces V1; V2 ⊂ V , define when V is a direct sum of V1 and V2, denoted V = V1 ⊕ V2. Show that in our case,
V = W ⊕ W⊥.
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