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# Check (2 1,0 0),(0 0,2 0),(3 -1,0 0),(0 3, 0 1) is a bais for M22 or not? # Check (2 1,0 0),(0 0,2 0),(3 -1,0 0),(0 3, 0 1) is a bais for M22 or not?

Question
Matrix transformations asked 2020-12-21
Check $$(2 1,0 0),(0 0,2 0),(3 -1,0 0),(0 3, 0 1)$$ is a bais for M22 or not?

## Answers (1) 2020-12-22
Recall: Basis Let V be a vector space over a field F. A set of S of vectors in V is snid to be a basis of V if (i) S is linearly independent in V, and
(ii) S generates V ie. linear span of $$S, L(S) = V$$
Theorem: Let V be a vector space of dimension n over a field F. Then any linearly independent set of n vectors of V is a basis of V.
$$M_{22}$$ is the vector space of all $$2 \times 2$$ real matrices.
Let $$S = \left\{\left(\begin{array}{c}21\\ 00\end{array}\right), \left(\begin{array}{c}00\\ 21\end{array}\right), \left(\begin{array}{c}3-1\\ 00\end{array}\right),\left(\begin{array}{c}00\\ 31\end{array}\right)\right\}$$
We have to show that 5 is a basis of $$M_{22}$$
Let $$\alpha_{1} = \left\{\left(\begin{array}{c}21\\ 00\end{array}\right),\alpha_{2}= \left(\begin{array}{c}00\\ 21\end{array}\right),\alpha_{3}= \left(\begin{array}{c}3-1\\ 00\end{array}\right),\alpha_{4}=\left(\begin{array}{c}00\\ 31\end{array}\right)\right\}$$
Let us consider the relation
$$c_{1} \alpha_{1} + c_{2} \alpha_{2} + c_{3} \alpha_{3} + c_{4} \alpha_{4} = 0$$
where $$c_{1}, c_{2}, c_{3}, c_{4} \in RR.$$
Then we have $$c_{1} = \left(\begin{array}{c}21\\ 00\end{array}\right),+c_{2} \left(\begin{array}{c}00\\ 21\end{array}\right),+c_{3} \left(\begin{array}{c}3-1\\ 00\end{array}\right),+c_{4}\left(\begin{array}{c}00\\ 31\end{array}\right)=\left(\begin{array}{c}00\\ 00\end{array}\right) \Rightarrow \left(\begin{array}{c}2c_{1}+3c_{3}c_{1}-c_{3}\\ 2c_{2}+3c_{3}c_{2}+c_{4}\end{array}\right)=\left(\begin{array}{c}00\\00\end{array}\right)$$
Fron the above equation we get,
$$2c_{1} + 3c_{3} = 0$$
$$c_{1} - c_{3} = 0$$
$$2c_{2} + 3c_{4} = 0$$
$$c_{2} + c_{4} = 0$$
Solving these equation we get, $$c_{1} = 0, c_{2} = 0, c_{3} = 0, c_{4} = 0$$
This proves that the set $${\alpha_{1}, \alpha_{2}, \alpha_{3}, \alpha_{4}}$$ is lineary independent.
Now, we know that $$M_{22}$$ is a vector space of dimension 4 and its standard
basis is \left\{\left(\begin{array}{c}10\\00\end{array}\right),\left(\begin{array}{c}01\\ 00\end{array}\right), \left(\begin{array}{c}00\\ 10\end{array}\right), \left(\begin{array}{c}00\\ 01\end{array}\right)\right\}\)
As the dimension of $$M_{22}\ is\ 4\ and\ {\alpha_{1}, \alpha_{2}, \alpha_{2}, \alpha_{4}}$$ is a linearly independent
set containing 4 vectors of $$M_{22},$$
therefore the set $${\alpha_{1}, \alpha_{2}, \alpha_{3}, \alpha_{4}}$$
is a basis of $$M_22$$.
Result:
$$\left\{\left(\begin{array}{c}21\\00\end{array}\right),\left(\begin{array}{c}00\\ 21\end{array}\right), \left(\begin{array}{c}3-1\\ 00\end{array}\right), \left(\begin{array}{c}00\\ 31\end{array}\right)\right\}$$
is a basis for $$M_{22}$$

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