Поняття матриці


Математика и математический анализ

Числа αij називаються елементами матриці. Положення кожного елемента в матриці визначається номерами рядка і стовпчика в яких знаходиться цей елемент. Наприклад елемент знаходиться в му рядку і стовпчику матриці А.



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Поняття матриці.

Квадратною матрицею порядку n називається квадратна таблиця чисел, яка має n рядків і n стовпчиків.


Числа αij називаються елементами матриці. Положення кожного елемента в матриці визначається номерами рядка і стовпчика, в яких знаходиться цей елемент. Це положення часто позначається індексами. Наприклад,  елемент  знаходиться в -му рядку і  стовпчику матриці А.

Визначники другого  і третього порядків формально записуються у вигляді квадратних таблиць чисел.

,   .

Числа в цих таблицях називаються елементами визначника. Кожному такому визначнику відповідає квадратна матриця відповідно порядків 2 і 3.


При цьому можна сказати, що визначник Δ2 є визначником матриці A2 , а визначник Δ3  - визначником матриці A3.

Положення кожного елемента визначника, як  елемента матриці, визначається номерами рядка і стовпчика, як часто позначаються парою індексів.


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