ohmygoodness

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6 Questions

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3	There exists an injection from $X$ to $Y$ if and only if there exists a surjection from $Y$ to $X$.
2	An injection from an infinite set $X$ to $\mathbb{N}\implies X$ is countable.
2	What is the topology on $[0,1]^2$ in the defintion of a homotopy?
2	Should I use sets or tuples when dealing with linear dependence?
1	Does $(A\cup B)\cap(C\cup D)=(A\cap C)\cup(B\cap D)$?

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66 Reputation

+10	What is the topology on $[0,1]^2$ in the defintion of a homotopy?
+10	Should I use sets or tuples when dealing with linear dependence?
+8	Does $(A\cup B)\cap(C\cup D)=(A\cap C)\cup(B\cap D)$?
+5	There exists an injection from $X$ to $Y$ if and only if there exists a surjection from $Y$ to $X$.

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0 elementary-set-theory × 4	0 linear-algebra
0 homework	0 algebraic-topology
0 vector-spaces	0 general-topology

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