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All rings are supposed to have a unit element $1$ here.
Let $N\subset \mathbb N_{\geqslant 2}$ be the set such that $n\in N $ if, and only if, there does not exist a non commutative ring of cardinal $n$.
For instance, $16\notin N$ because $A=M_2(\mathbb F_2)$ is a non commutative ring and $\ver...
Guys I have this problem:
Is it true that the tautological bundle on $\mathbb{P}^1(\mathbb{C})$ given by $L(-1)=\lbrace (\ell,z)\in\mathbb{P}^1\times \mathbb{C}^2 \: : \: z\in \ell \rbrace $ is a subbundle of $L(0)^2$, where $L(0)\cong \mathbb{P}^1\times \mathbb{C}$ ?
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