52,024 reputation
22162
bio website
location Albany, CA
age
visits member for 2 years
seen 16 hours ago

If I see further than most, it is because I have stood on the toes of giants and they kicked me high into the air...

However, there is nothing to suggest that I see further than most.

I am (inasmuch as one 'is' an occupation) an engineer. My mathematical skills are rather pedestrian, with a rare insight every now and then. I have been lucky enough to sit in the same room with some famous mathematicians & engineers. My Erdős number is 5, which undoubtedly makes me as unique as an Irishman in a pub. And I have been spotted in The Pub from time to time.

In professional circumstances, my value add has usually been the injection of common sense and completion of grunt work when perspectives and energies are unfocused.

My current age divides the current year.

My real name is Joe Higgins. Apparently, my last name means 'of the Viking' in Irish.

My alma mater is University College, Cork in Ireland, and I had the additional privilege of obtaining my Phd. from the University of California at Berkeley under the enlightened tutelage of Lucien Polak.

I can be reached at joe dot higgins at gmail dot com.


Nov
28
comment solid angle vector field
Yes, the answer is
Nov
28
reviewed Approve suggested edit on p-adic-number-theory tag wiki excerpt
Nov
28
reviewed Approve suggested edit on p-adic-number-theory tag wiki
Nov
28
answered Differentiating under the integral sign chain rule
Nov
28
answered Find the dimensions of a cylinder of given volume V if its surface area is a minimum.
Nov
28
comment Find the dimensions of a cylinder of given volume V if its surface area is a minimum.
The volume constraint gives $h$ in terms of $r$ directly.
Nov
28
answered Prove that $X$ is a compact .
Nov
28
answered Left-continuous function defined on measure
Nov
28
comment Operators between normed linear spaces
Could you elaborate on the flaws please?
Nov
28
reviewed Approve suggested edit on How would I go about proving this?
Nov
28
answered projections of a vector space and a linear operator on this vector space
Nov
27
reviewed Reject suggested edit on compactness of the set of invariant measures
Nov
27
answered Mean value theorem problem (I think)
Nov
27
comment Intuitive explanation for formula of maximum length of a pipe moving around a corner?
I'm not sure what you are asking. The formula for the longest pipe $L(\theta)$ that can fit across the bend at angle $\theta$ is straightforward to work out. A pipe can go around the bend iff the pipe length is less than $L(\theta)$ for all $\theta \in [0, \frac{\pi}{2}]$, which is where the minimization comes in. By parameterizing the problem differently, you can avoid the angles, but end up with the same result.
Nov
27
comment is the empty set a relation?
@PedroTamaroff: It is that time of year in the USA :-).
Nov
27
comment is the empty set a relation?
It is a vacuous relation.
Nov
27
answered Unitary map between sets of vectors
Nov
27
comment The actual meaning of projection
The different vector will be the same, the component along the normal will depend on the length and direction (as in $\pm$) of the normal. For example, if the component along $n$ is $\alpha$, then the component along $0.1 n$ will be $10 \alpha$.
Nov
27
comment The actual meaning of projection
The projection removes the component parallel to the normal, regardless of the length of the normal (which must be non-zero).
Nov
27
reviewed Approve suggested edit on prove that the shapes are isometric