授業概要
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複素関数論入門 1. 複素数・複素平面・複素数演算の幾何学的意味 2. 複素変数の関数と正則性(その1: 平面写像との比較,微分可能性,コーシー・リーマンの定理) 3. 複素変数の関数と正則性(その2: べき乗関数,指数関数,三角関数,有理関数,双曲線関数) 4. 複素変数の関数と正則性(その3: つづき.対数関数,べき乗根,一般のべき) 5. 複素積分とその応用(その1: 線積分,線積分計算例,円周および矩形周の場合のコーシーの積分定理) 6. 複素積分とその応用(その2: コーシーの積分公式の応用,計算例exp(−x2) cos(ax) など) 7. コーシーの積分公式とテイラー展開(その1:導出と説明.テイラー級数の収束の簡略な扱い) 8. コーシーの積分公式とテイラー展開(その2:例) 9. 留数定理とその応用(その1: 特異点,極,零点,留数,例:1次分数関数,簡単な有理関数) 10. 留数定理とその応用(その2: ローラン展開と説明.計算例) 11. 留数定理とその応用(その3: 定積分への応用.簡単な例) 12. 1次分数変換と 等角写像
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Introduction to complex analysis 1.Geometric interpretations of complex numbers, complex plane and arithmetic operations of complex numbers. 2.Functions of complex variables and holomorphic functions (1): comparison to functions on a plane, differentiability, Cauchy-Riemann’s theorem. 3.Functions of complex variables and holomorphic functions (2): power functions, exponential functions, trigonometric functions, rational functions, hyperbolic functions. 4.Functions of complex variables and holomorphic functions (3): logarithmic functions, n-th root function, general power functions. 5.Complex integral and its applications (1): line integral, calculation examples of line integral, Cauchy’s integral theorem for circumferences and rectangles. 6.Complex integral and its applications (2): applications of Cauchy’s integral formula, calculation examples (e.g., exp(-x2)cos(ax)). 7.Cauchy’s integral formula and Taylor expansion (1): derivation and exposition,simple manipulation for convergence of Taylor series. 8.Cauchy’s integral formula and Taylor expansion (2): examples. 9.Residue theorem and its applications (1): singularities, poles, zero points, residues, examples:linear fractional functions, simple rational functions 10.Residue theorem and its applications (2): Laurent expansion and exposition, calculation examples. 11.Residue theorem and its applications (3): applications to definite integral, simple examples. 12.Linear fractional transformations and conformal mappings."
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