# MATH 845: Class Field Theory | UW–Madison

[View on UW Courses](https://uwcourses.com/courses/MATH_845)

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## course

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### subjects

* MATH

### title

CLASS FIELD THEORY

### description

Introduction to local and global class field theory. Theory of local fields; local and global class field theory; complex multiplication, adeles, ideles, idele class characters, Tchebotarev's Density Theorem, CM elliptic curves, construction of class fields of imaginary quadratic fields.

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### llm summary

MATH 845 introduces local and global class field theory, covering adeles, ideles, and CM elliptic curves.

### llm topics

* Theory of local fields
* Local and global class field theory
* Complex multiplication
* Adeles, ideles, and idele class characters
* Tchebotarev's Density Theorem
* CM elliptic curves
* Construction of class fields of imaginary quadratic fields

### llm skills

* Understanding local and global class field theory
* Analyzing adeles, ideles, and idele class characters
* Applying Tchebotarev's Density Theorem
* Constructing class fields of imaginary quadratic fields

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* complex multiplication elliptic curves

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      "sections": 29
    },
    "instructor_url": "/instructors/SIMON_MARSHALL--instructor_8779cbf2cbe1e0b379b7d322"
  },
  {
    "instructor_uid": "instructor_8e516e076f29ce5d673213e8",
    "source": "madgrades",
    "source_instructor_id": "6487929",
    "identity_basis": "source_id",
    "identity_status": "source_identified",
    "name": "BRIAN LAWRENCE",
    "email": null,
    "first_observed_at": "2026-09-06 23:14:58.172943+00:00",
    "last_observed_at": "2026-09-07 15:55:43.033547+00:00",
    "ratings": {
      "review_count": 35,
      "quality": 4.57,
      "difficulty": 3.03,
      "quality_count": 35,
      "difficulty_count": 35,
      "profile_id": "rmp:2827329",
      "source_url": "https://www.ratemyprofessors.com/professor/2827329",
      "match_basis": "exact_name",
      "observed_at": "2026-09-07 16:51:09.107287+00:00",
      "courses": {},
      "bayesian_quality": 4.2389766485623985,
      "prior_mean": 3.6596857835465957,
      "prior_weight": 20
    },
    "grade_statistics": {
      "gpa": 2.661,
      "graded": 832,
      "counts": [
        213,
        51,
        194,
        55,
        185,
        94,
        40
      ],
      "sections": 9
    },
    "instructor_url": "/instructors/BRIAN_LAWRENCE--instructor_8e516e076f29ce5d673213e8"
  }
]
```

### grades

```json
[
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1074",
    "term_name": "Spring 2007",
    "instructors": [
      "YANNAN QIU"
    ],
    "a": 11,
    "ab": 0,
    "b": 0,
    "bc": 0,
    "c": 0,
    "d": 0,
    "f": 0,
    "satisfactory": 0,
    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
    "no_work": 0,
    "not_reported": 0,
    "other": 0,
    "total": 11,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1094",
    "term_name": "Spring 2009",
    "instructors": [
      "Jordan Ellenberg"
    ],
    "a": 20,
    "ab": 0,
    "b": 0,
    "bc": 0,
    "c": 0,
    "d": 0,
    "f": 0,
    "satisfactory": 0,
    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
    "no_work": 0,
    "not_reported": 0,
    "other": 0,
    "total": 20,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1114",
    "term_name": "Spring 2011",
    "instructors": [
      "NIGEL BOSTON"
    ],
    "a": 13,
    "ab": 2,
    "b": 1,
    "bc": 0,
    "c": 1,
    "d": 0,
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    "satisfactory": 0,
    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
    "no_work": 0,
    "not_reported": 0,
    "other": 0,
    "total": 17,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1154",
    "term_name": "Spring 2015",
    "instructors": [
      "Tonghai Yang"
    ],
    "a": 24,
    "ab": 0,
    "b": 0,
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    "d": 0,
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    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
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    "not_reported": 0,
    "other": 0,
    "total": 24,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1174",
    "term_name": "Spring 2017",
    "instructors": [
      "NIGEL BOSTON"
    ],
    "a": 10,
    "ab": 4,
    "b": 2,
    "bc": 0,
    "c": 0,
    "d": 0,
    "f": 0,
    "satisfactory": 0,
    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
    "no_work": 0,
    "not_reported": 0,
    "other": 0,
    "total": 16,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1194",
    "term_name": "Spring 2019",
    "instructors": [
      "SIMON MARSHALL"
    ],
    "a": 8,
    "ab": 0,
    "b": 0,
    "bc": 0,
    "c": 0,
    "d": 0,
    "f": 0,
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    "unsatisfactory": 0,
    "credit": 0,
    "no_credit": 0,
    "passed": 0,
    "incomplete": 0,
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    "other": 0,
    "total": 8,
    "source_aliases": [
      "MATH 845"
    ]
  },
  {
    "run_id": "20260907T155543-ce3781c4",
    "semester": "1272",
    "observed_at": "2026-09-07 15:55:43.033547+00:00",
    "course_id": "MATH 845",
    "course_uid": "course_2f67171e98d0175542979e4a",
    "term_id": "1244",
    "term_name": "Spring 2024",
    "instructors": [
      "BRIAN LAWRENCE"
    ],
    "a": 17,
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    "b": 0,
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    "c": 0,
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    "credit": 0,
    "no_credit": 0,
    "passed": 0,
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    "other": 0,
    "total": 17,
    "source_aliases": [
      "MATH 845"
    ]
  }
]
```

### statistics

#### gpa

3.929

#### graded

113

#### counts

* 103
* 6
* 3
* 0
* 1
* 0
* 0

### grade conflicts

None recorded.

### evidence

#### history

* [/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/history/course\_2f67171e98d0175542979e4a-0.json](https://uwcourses.com/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/history/course_2f67171e98d0175542979e4a-0.json)

#### traces

* [/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/traces/course\_2f67171e98d0175542979e4a-0.json](https://uwcourses.com/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/traces/course_2f67171e98d0175542979e4a-0.json)

#### results

* [/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/results/course\_2f67171e98d0175542979e4a-0.json](https://uwcourses.com/data/e243353dcb7d79b7247ced91d69443ef4c2a6349/results/course_2f67171e98d0175542979e4a-0.json)

### revision

e243353dcb7d79b7247ced91d69443ef4c2a6349

## context

### all

#### term



#### gpa

3.9292035398230087

#### count

113

#### university

##### size

2933

##### gpa Percentile

84

##### count Percentile

53

##### median Count

103

##### histogram

| range   | count | current |
| ------- | ----- | ------- |
| 0.0–0.4 | 0     | false   |
| 0.4–0.8 | 0     | false   |
| 0.8–1.2 | 0     | false   |
| 1.2–1.6 | 0     | false   |
| 1.6–2.0 | 0     | false   |
| 2.0–2.4 | 1     | false   |
| 2.4–2.8 | 24    | false   |
| 2.8–3.2 | 320   | false   |
| 3.2–3.6 | 934   | false   |
| 3.6–4.0 | 1654  | true    |

#### departments

```json
[
  {
    "subject": "MATH",
    "comparison": {
      "size": 79,
      "gpaPercentile": 77,
      "countPercentile": 47,
      "medianCount": 122,
      "histogram": [
        {
          "range": "0.0–0.4",
          "count": 0,
          "current": false
        },
        {
          "range": "0.4–0.8",
          "count": 0,
          "current": false
        },
        {
          "range": "0.8–1.2",
          "count": 0,
          "current": false
        },
        {
          "range": "1.2–1.6",
          "count": 0,
          "current": false
        },
        {
          "range": "1.6–2.0",
          "count": 0,
          "current": false
        },
        {
          "range": "2.0–2.4",
          "count": 1,
          "current": false
        },
        {
          "range": "2.4–2.8",
          "count": 8,
          "current": false
        },
        {
          "range": "2.8–3.2",
          "count": 25,
          "current": false
        },
        {
          "range": "3.2–3.6",
          "count": 12,
          "current": false
        },
        {
          "range": "3.6–4.0",
          "count": 33,
          "current": true
        }
      ]
    }
  }
]
```

### terms

#### 1074

##### term

1074

##### gpa

4

##### count

11

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1094

##### term

1094

##### gpa

4

##### count

20

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1114

##### term

1114

##### gpa

3.764705882352941

##### count

17

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1154

##### term

1154

##### gpa

4

##### count

24

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1174

##### term

1174

##### gpa

3.75

##### count

16

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1194

##### term

1194

##### gpa

4

##### count

8

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

#### 1244

##### term

1244

##### gpa

4

##### count

17

##### departments

| subject | comparison |
| ------- | ---------- |
| MATH    |            |

### benchmarks

#### all

##### school

###### size

2933

###### gpa

3.6032196701769106

###### top Share

78.47718527704623

###### count

103

##### MATH

###### size

79

###### gpa

3.394885046645041

###### top Share

67.36340770839756

###### count

122

#### terms

##### 1074

###### school

###### size

695

###### gpa

3.3616924722887376

###### top Share

63.22509110105764

###### count

69

###### MATH

###### size

17

###### gpa

2.821339129045922

###### top Share

38.66654769268061

###### count

133

##### 1094

###### school

###### size

758

###### gpa

3.3891454428111527

###### top Share

64.36369814389255

###### count

71

###### MATH

###### size

19

###### gpa

2.861322177541941

###### top Share

40.26350030907326

###### count

108

##### 1114

###### school

###### size

804

###### gpa

3.3696004653806844

###### top Share

64.0389334741844

###### count

68

###### MATH

###### size

26

###### gpa

2.9090822348911582

###### top Share

41.14706210117883

###### count

83.5

##### 1154

###### school

###### size

935

###### gpa

3.4282378385810093

###### top Share

67.66674668721691

###### count

63

###### MATH

###### size

33

###### gpa

2.9834698949629033

###### top Share

46.71989715257013

###### count

69

##### 1174

###### school

###### size

955

###### gpa

3.4597947384071412

###### top Share

69.5290038366363

###### count

69

###### MATH

###### size

32

###### gpa

2.992971960864239

###### top Share

44.393513280464695

###### count

89

##### 1194

###### school

###### size

1040

###### gpa

3.4906527436719808

###### top Share

71.74728845515045

###### count

67

###### MATH

###### size

38

###### gpa

3.133406260873163

###### top Share

53.17595010634325

###### count

71.5

##### 1244

###### school

###### size

1241

###### gpa

3.5975573126929192

###### top Share

78.29036874847135

###### count

65

###### MATH

###### size

43

###### gpa

3.228240949537157

###### top Share

55.86451059486035

###### count

68

## instructor Trends

```json
[
  {
    "uid": "instructor_247d961acdc61511ccc819c5",
    "name": "NIGEL BOSTON",
    "count": 33,
    "terms": [
      {
        "term": "1114",
        "count": 17,
        "sections": 1,
        "gpa": 3.764705882352941
      },
      {
        "term": "1174",
        "count": 16,
        "sections": 1,
        "gpa": 3.75
      }
    ]
  },
  {
    "uid": "instructor_91a8295117bb0ce7b172a161",
    "name": "TONGHAI YANG",
    "count": 24,
    "terms": [
      {
        "term": "1154",
        "count": 24,
        "sections": 1,
        "gpa": 4
      }
    ]
  },
  {
    "uid": "instructor_627bd6efdd66a1083f8cbb97",
    "name": "JORDAN ELLENBERG",
    "count": 20,
    "terms": [
      {
        "term": "1094",
        "count": 20,
        "sections": 1,
        "gpa": 4
      }
    ]
  },
  {
    "uid": "instructor_8e516e076f29ce5d673213e8",
    "name": "BRIAN LAWRENCE",
    "count": 17,
    "terms": [
      {
        "term": "1244",
        "count": 17,
        "sections": 1,
        "gpa": 4
      }
    ]
  },
  {
    "uid": "instructor_2526da1b4d60f44a1bea00f0",
    "name": "YANNAN QIU",
    "count": 11,
    "terms": [
      {
        "term": "1074",
        "count": 11,
        "sections": 1,
        "gpa": 4
      }
    ]
  },
  {
    "uid": "instructor_8779cbf2cbe1e0b379b7d322",
    "name": "SIMON MARSHALL",
    "count": 8,
    "terms": [
      {
        "term": "1194",
        "count": 8,
        "sections": 1,
        "gpa": 4
      }
    ]
  }
]
```

## following

None recorded.
