- #1
Rasalhague
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Meaning of "we require that"
Wikipedia: Dynamical system:
Does this mean
(1) If I(x) = T for all x in S, then S is Φ-invariant?
(2) If S is Φ-invariant, then I(x) = T for all x in S?
(3) If and only if S is Φ-invariant, then I(x) = T for all x in S?
(I.e. The above definition of Φ-invariance of S is equivalent to the the requirement that I(x) = T for all x in S.)
Wikipedia: Dynamical system:
In particular, for S to be Φ-invariant, we require that I(x) = T for all x in S. That is, the flow through x should be defined for all time for every element of S.
Does this mean
(1) If I(x) = T for all x in S, then S is Φ-invariant?
(2) If S is Φ-invariant, then I(x) = T for all x in S?
(3) If and only if S is Φ-invariant, then I(x) = T for all x in S?
(I.e. The above definition of Φ-invariance of S is equivalent to the the requirement that I(x) = T for all x in S.)
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