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Another criteria for injectivity and surjectivity

Linear map f: X -> Y (dim X = n, dim Y = m), its matrix (in some bases of the spaces) is A.

  • f injective <-> Ker f = 0 <-> dim Im f = dim X <-> Rg A = n
  • f surjective <-> dim Im f = dim Y <-> Rg A = m
  • f bijective <-> Rg A = n = m

Related: #56.

Seminar 5 (Geome): Solutions

  • 5.2(1): Точка пересечения прямых. Не сложно (нет).
  • 5.34(2): Способ "школьное решение" — через аккуратный рисунок + геометрию.

--

Related PR: #41

Seminar 9 (2nd Order Surfaces)

Спутник (гипербола), солнечные часы (гипербола), чипса (гиперболический параболоид), и башня (однополостный гиперболоид).

Seminar 10 (Affine)

Кружочки для иллюстрации инъекции, сюръекции и биекции.

Seminar 10 (Affine): Typos

Нашёл ещё опечатку! на 3-й странице внизу "коэффициент сжатия" больше 1 наверно

k

На 9-ой странице внизу правый нижний элемент матрицы a_2

a2

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