Garnak Olegovitc

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132 reputation

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19 Questions

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4	Proof by contradiction: $ \emptyset \subseteq A$
2	Proof: $A \neq \emptyset \implies A \nsubseteq \emptyset $
2	Proof $(A-\{a\}) \sim (B - \{b\}) $
2	Proof: let $A$ a ring, then $(-a) \cdot (-b) = a \cdot b $ $\forall a,b \in A$
2	Proof by contradiction: $ S \subseteq \emptyset \rightarrow S= \emptyset $

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132 Reputation

+3	If $F$ and $R$ are subspaces of vector space $E$, then $F \cap R \neq \varnothing$
+10	Proof $(A-\{a\}) \sim (B - \{b\}) $
+10	Proof: let $A$ a ring, then $(-a) \cdot (-b) = a \cdot b $ $\forall a,b \in A$
-2	Proof: if $b$ is inverse element of $a$ then $a$ is inverse element of $b$

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0 Answers

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13 Tags

0 abstract-algebra × 8	0 proof-writing × 2
0 linear-algebra × 8	0 group-theory × 2
0 elementary-set-theory × 5	0 proof-strategy
0 universal-algebra × 3	0 ring-theory
0 geometry × 2	0 cardinals

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$Mathematics Stack Exchange$	Mathematics	132 rep	6
	Stack Overflow	1 rep
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	1 rep
	Programmers	1 rep
	Android Enthusiasts	1 rep

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Peer Pressure	Commentator
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