3,046 reputation
1618
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location Italy
age 47
visits member for 3 years, 6 months
seen 6 hours ago

Mathematical Physics researcher. Linux user from 1996. C programmer from 1996 to 2002. Mainly oriented to shell programming, package management tools and in general to command line.


7h
comment Equation of a Tangent Plane
@user7000: $\mathbf{n}$ should be evaluated at $P_0$, so $u,v$ should be substituted with $u_0=1$ and $v_0=1$.
8h
comment Equation of a Tangent Plane
As said, $P=(x,y,z)$ and $P_0=(x_0,y_0,z_0)$, where $x_0=u_0^2=1$, $y_0=v_0^2=1$ and $z_0=u_0v_0=1$.
9h
comment how to find matrix from its exponential form
If $A$ is not diagonalizable?
9h
answered Equation of a Tangent Plane
21h
revised What's wrong with my aproach to solving this equation with multiple logarithms?
added 12 characters in body
22h
revised Symmetric matrix multiplication
added 9 characters in body
22h
comment Express summation in terms of matrix norm
Next time use $\LaTeX$ only for mathematical symbols.
22h
revised Express summation in terms of matrix norm
deleted 71 characters in body
1d
comment Math question: Calculus
very good title
1d
comment $-\varepsilon\log(x)\overset{?}{\geq} -\log(\varepsilon x)$
Fixed the link.
1d
revised $-\varepsilon\log(x)\overset{?}{\geq} -\log(\varepsilon x)$
added 1 character in body
1d
answered Osculating circles intersecting a given point
1d
revised Given the equation of the parabola, for what values of $t$ will the quadratics have $0$, $1$, or $2$ solutions?
added 34 characters in body; edited title
1d
revised Number of non zero integer values of $k$ for which the points ($k,k^2)$ lies inside the triangle formed by the given three lines
added 10 characters in body; edited title
1d
revised The complex equation
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1d
revised Find value of $x$ for: $(1/3)(1-x) \geq 2(x-3)$
added 41 characters in body; edited title
1d
revised Family of lines $\sin\alpha x +\sin\beta y +\sin\gamma =0$
edited title
1d
comment Difference between subspace and subset
The tag "convex-analysis" does not seem well chosen.
1d
revised Apps for making geometric shapes
edited title
1d
revised Find $n$ for which $(1+i)^{2n}=(1-i)^{2n}$
edited title