UnkleRhaukus
  • UnkleRhaukus
\[\neg[\forall x[x < 0 \Rightarrow\exists y (y^2 = x)]]\iff\exists x[x\geq0\Rightarrow\forall y(y^2\neq x)]\]
Meta-math
chestercat
  • chestercat
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UnkleRhaukus
  • UnkleRhaukus
am i right/
UnkleRhaukus
  • UnkleRhaukus
no wait , i see error
UnkleRhaukus
  • UnkleRhaukus
the negation of an implication

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helder_edwin
  • helder_edwin
the negation of \(\to\) is \(\wedge\)
UnkleRhaukus
  • UnkleRhaukus
yeah
helder_edwin
  • helder_edwin
\[ \large \neg(p\to q)\equiv p\wedge\neg q \]
UnkleRhaukus
  • UnkleRhaukus
\[\exists x[x<0\wedge\forall y(y^2\neq x)]\]
swissgirl
  • swissgirl
Ya that makes more sense
swissgirl
  • swissgirl
hmmm you edited your question but its still incorrect
UnkleRhaukus
  • UnkleRhaukus
\[\neg\left[\forall x[x < 0 \Rightarrow\exists y (y^2 = x)]\right]\iff\exists x\left[x<0\land\forall y(y^2\neq x)\right]\]
swissgirl
  • swissgirl
Yes thats the answer
UnkleRhaukus
  • UnkleRhaukus
thanks to you both
swissgirl
  • swissgirl
not that I helped :P
helder_edwin
  • helder_edwin
u r welcome

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