Notes

Вот пример класса "Matrix" на языке C#, в котором перегружены операции "+" и "-" для работы с матрицами:

```csharp
using System;

public class Matrix
{
private int rows;
private int columns;
private int[,] data;

public Matrix(int rows, int columns)
{
this.rows = rows;
this.columns = columns;
data = new int[rows, columns];
}

public int Rows
{
get { return rows; }
}

public int Columns
{
get { return columns; }
}

public int this[int row, int column]
{
get { return data[row, column]; }
set { data[row, column] = value; }
}

public static Matrix operator +(Matrix m1, Matrix m2)
{
if (m1.Rows != m2.Rows || m1.Columns != m2.Columns)
{
throw new ArgumentException("Matrix dimensions must match.");
}

Matrix result = new Matrix(m1.Rows, m1.Columns);

for (int i = 0; i < m1.Rows; i++)
{
for (int j = 0; j < m1.Columns; j++)
{
result[i, j] = m1[i, j] + m2[i, j];
}
}

return result;
}

public static Matrix operator -(Matrix m1, Matrix m2)
{
if (m1.Rows != m2.Rows || m1.Columns != m2.Columns)
{
throw new ArgumentException("Matrix dimensions must match.");
}

Matrix result = new Matrix(m1.Rows, m1.Columns);

for (int i = 0; i < m1.Rows; i++)
{
for (int j = 0; j < m1.Columns; j++)
{
result[i, j] = m1[i, j] - m2[i, j];
}
}

return result;
}
}
```