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May
14
comment Critique my proof? Proving f(x) is continuous at x = 0 for a defined function.
You cannot assume that $f(x_n)=0$ for all $x_n$ with $|x-x_n|<\delta$. Also, you fail to actually exhibit a $\delta>0$ for given $\epsilon>0$ (you merely repeat your wishlist)
May
14
answered If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
May
14
comment If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
In your example $a=1^2$ and $b=n^2$ are squares, so that is not of relevance here. (Also you mean $n^2=ab$ instead of $n=a^2b^2$). Just because $1$ is also a cube etc., does not mean it's not a square ($64=8^2$ is also a cube).
May
14
answered Determine length from sketch
May
14
revised infinite order of element with element in an infinite group
added 17 characters in body
May
14
answered infinite order of element with element in an infinite group
May
14
answered Division of $t^a-1$ by $t^b-1$
May
14
revised How do I compute this recursive function efficiently?
added 13 characters in body
May
14
answered How do I compute this recursive function efficiently?
May
14
answered Property of the sequence of primes
May
14
comment Can I calculate the surface area of an irregular 3d shape using known areas of $X,Y,Z$ planes
What is the surface of a point cloud? Do you mean its covex hull? - And what are areas of X, Y, Z plane? Do you mean the projections of the body? These are certainly not sufficient to find the surface area as a few simple examples should tell you
May
14
answered Incorrect Euler Totient Function definition?
May
14
answered Showing a particular recurrence is constant
May
14
answered Circle inside circular sector
May
14
answered Isn't the modus ponens just the definition of what 'if' means?
May
14
comment Need simple logic or formula for the below problem!
You mean to find $f(x,y,z):=\min\{\,ax+by-z\mid a,b\in \mathbb N_0, ax+by\ge z\,\}$?
May
14
comment If a composition of two maps is smooth, as well as one of the maps, then so is the other.
If one of $f,g$ is constant then the other can be arbitrary
May
14
comment Is the sphere with a diameter homotopy equivalent to a surface?
Additionally, note that the surface must be compact as the given space is compact. Hence things like $\mathbb S^1\times\mathbb R$ are excluded
May
14
comment Group Properties - “$a$” commutes “$b$”?
Yes, exactly that. And there is not really much to show, is there?
May
14
comment Simple Turing machine problems
What is hMi here?