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7h
comment What is an axiom in layman's terms?
you're very welcome @AndyK enjoy!
8h
comment What is an axiom in layman's terms?
as long as we agree that there is no recognishion involved.
8h
comment What is an axiom in layman's terms?
is the consistent spelling 'Euklid' intentional?
8h
answered What is an axiom in layman's terms?
1d
revised Which infinity is meant in limits?
edited body
1d
awarded  Nice Answer
2d
revised Metric assuming the value infinity
deleted 1 character in body
2d
awarded  Good Answer
Apr
24
comment What is the maximum value of $\int_{0}^{2}{h(t)}dt$?
welcome to MSE. Please note this is not a good way to pose a question here. What is the purpose of you asking this question here? What have you tried? Where are you stuck? You have to be clear about these things if you want to get helpful answers.
Apr
21
accepted compact-open metrizability
Apr
17
comment Limit point symmetric?
Assuming your interpretation of $x$ is a limit point of $y$ is that $x$ belongs to the closure of $\{y\}$, the answer is that in an arbitrary topological space $X$ the relation $x\in Cl(y)$ need not imply $y\in Cl(x)$, as is very well-known. Very minimal separation conditions do imply the implication, as is also very well-known.
Apr
16
comment Is set membership relation a set?
If the set of all sets exists (call it $U$), then the membership relation is the set $\{(x,y)\in U\times U\mid x\in y\}$. So if the set theory you work with allows for the constructions needed for this definition of a set, then you're done.
Apr
14
comment Why isn't '&' used for logical conjunction?
@Constantine just like painting is not about brushes, but a question about a new style of brush certainly is of interest and belongs to world of painting, so is mathematics not about notation, but a question about some notational style is of interest and belongs to the world of mathematics.
Apr
14
comment Why isn't '&' used for logical conjunction?
you may wish to correct the year for Peano. I doubt he practiced mathematics in 1988....
Apr
13
awarded  Necromancer
Apr
12
comment closed union of closed sets
Would anything go wrong if one takes the upper Vietoris topology? or the Vietoris topology?
Apr
12
comment Proof that $0^0 \neq 1$
what is your definition of $0^0$?
Apr
12
comment closed union of closed sets
I'm interested in a convenient formalism for upper/lower semicontinuous functions, primarily in the context of generalised inverse limits of compacta (and generalisations thereof).
Apr
12
comment closed union of closed sets
Yes @StuKraji do you have a good reference?
Apr
11
awarded  Nice Question