which of these two phrases is correct?  A - The man, WHOM from now on we will refer to as Jim, approaches the table and stands next to the lady.   B - The man, WHO from now on we will refer to as Jim, approaches the table and stands next to the lady.   None of my native English speaker friends do not agree on which one is correct.  Thanks.
I can never figure out whether I should use who and whom. Most people use who for both colloquially, but some people say this is not correct.  What’s the rule for using who and whom correctly?
The coefficient of kinetic friction can be calculated using $\mu_k = F_k/F_n$. A change in angle does not affect the normal force, but doesn't a change in angle affect the friction? As in if the angle is steeper, wouldn't the object have a greater propensity to move down the slope, thus there will be less friction? Extracting phone number from string How to overwrite an excel application without prompting the users Suppose k is an integer such that $6k + 1$, $12k + 1$, $18k + 1$ are primes. Show that $n = (6k + 1)(12k + 1)(18k + 1)$ is a Carmichael number. Suppose k is an integer such that $6k + 1$, $12k + 1$, $18k + 1$ are primes. Show that $n = (6k + 1)(12k + 1)(18k + 1)$ is a Carmichael number.  This is a question on a past exam that I find difficulty to answer. Can anyone help? Badge "multiplier" a little bit misaligned on the profile page Well, you can see it for yourself. The badge multiplier is a bit misaligned. Can you fix this please? (I know it's kinda a minor issue but it's bugging me and it's somehow off)    If it helps, I'm using Chrome version 44.0.2403.125 m. (Also repro'ed on FireFox 39.0 and )    For no good reason, that's a screenie from 's profile page. How to know if something is a primitive concept, a law, a definition or a theorem Some basic Physics books are often misguiding in the sense that they don't make clear whether something is a primitive concept, a law, a definition or a theorem. This is often a little confusing. I've asked here some moments ago if there's a definition of force, and I've been redirected to a question about whether Newton's Laws are laws or definitions of mass and force.  This is just an example, but there are many others, like for instance, the conservation of energy, which some books present as a theorem, and some places says that this is a law of Physics. Time on the other hand, is something that according to Feynman's lectures on Physics, cannot be defined, so we just say how to measure it and leave it as a primitive concept.  In this context: how in general can we identify whether something is a primitive concept, a fundamental law of Physics, a definition or a theorem? Linked account +100 rep bonus also applied to account with 200 How can I convert timestamps in a column to a date? I have a file containing this:  1415602803,LOGIN SUCCESS,AUTH,user2,192.168.203.63,10.146.124.73,59996,22 1415602807,LOGIN SUCCESS,AUTH,user1,172.24.31.10,172.32.1.1,48191,22 1415602811,LOGIN FAILED,AUTH,root,172.24.166.153,10.146.124.73,52506,22 1415602815,LOGIN FAILED,AUTH,user3,192.168.123.55,10.146.32.99,55750,22   I want to convert the timestamp to a date in this format:  2014-11-10 02:00:03,LOGIN SUCCESS,AUTH,user2,192.168.203.63,10.146.124.73,59996,22 2014-11-10 02:00:07,LOGIN SUCCESS,AUTH,user1,172.24.31.10,172.32.1.1,48191,22 2014-11-10 02:00:11,LOGIN FAILED,AUTH,root,172.24.166.153,10.146.124.73,52506,22 2014-11-10 02:00:15,LOGIN FAILED,AUTH,user3,192.168.123.55,10.146.32.99,55750,22   How can I do that?  I know this works: perl -pe 's/(\d+)/localtime($1)/e' (from ) but the output format is Mon Nov 10 02:00:03 2014.  I know this command can convert timestamps into my desired output: date -d@1415602803 +"%F %H:%M:%S", but I couldn't make it work with awk using system("cmd") because of all the quotations and whatnot. How can I take pictures through a skyscraper, airplane, or train window? I find that I take a lot of pictures through skyscraper and vehicle windows (those that are impractical or impossible to open). There are all kinds of problems with taking photographs through windows: reflections from light inside, dirt on the window, etc. My technique mostly involves placing the lens directly on the window glass and shielding it from lights reflecting from above.   Are there any non-obvious gizmos / techniques for easily shooting through windows? I've heard that a polarizing filter might be used in this situation, but I don't carry one around most of the time. Besides, most of the pictures I am interested in taking are in low light situations (at sunset or in a moving train, etc). How to delete the files in one folder which are more than 60 days old in UNIX? If $G$ has no proper subgroup, prove that $G$ is cyclic of order $p$, where $p$ is a prime number.     I know that since $G $is a group with no proper subgroups, $g \in G$ is not just the identity. I don't know where to go from there. I have seen many camera review sites illustrate the effect of using different focal lengths on the same photograph using frames. There are also similar illustrations to compare different sensors (). I find this kind of visualization to be very useful in comparing the actual effect of the longer focal length\different sensor size. Of course the ability to do a wider focal length visualization would also be equally useful, but that's not possible.  Is there any ready-made software or plugin that enables this? If not, is there any simple technique to visualize the effect of longer focal lengths on an image (one would of course have to use the zoom information in the image EXIF data to accurately represent this)? All I can think of is to use some trigonometry to do the necessary calculations for the frame sizes for cropping. Inversion in "only [adverb] have they" Selecting one every n frames from a video using ffmpeg Solve $x=y\frac{dy}{dx}-\left(\frac{dy}{dx}\right)^{2}$ Is is possible to convert a .vdi file into a .iso that can be burned to a cd or dvd and make it like an installer. Or Is it possible to convert virtual machines to physical environments? On Travel-SE, there are currently  awarded. However, when one uses the search interface with views:2500, . The two numbers should be equal, and it's difficult to explain the difference with caching issues.   As the number of views is ever-increasing (as we all know, it's impossible to un-see things, unfortunately), this seems like a bug. Or perhaps I'm doing something wrong?  Also, some questions which should qualify don't appear on the search page. See , for example.  None of these questions are closed or deleted: views:2500 closed:yes and views:2500 deleted:yes return 0 results.  Eeeek? Another part of my daily  on SE sites.  When viewing a question and it's time to move on, I'll often simply click one of the tags in the question to bring me back to a list of questions with that tag.  This doesn't work in the Android app.  Obligitory screenshot.  I tried to draw a finger that looked like it was tapping a tag, but it ended up looking like, well...  something else, let's say. Can I buy (liquid) duty free at Dublin airport, before going through pre-clearance? Following on from my , I've been watching the  from the Dublin airport website. That mentions that after checkin, passengers clear normal Irish security checks, then proceed (via optional shopping) to a TSA-style security check before reaching the CBP juxtaposed border control. It also mentions that duty free shopping is available after immigration and customs.  That leads me to wonder - can I buy duty free liquids in the main bit of Dublin Airport, before reaching the US pre-clearance area? Or must all duty free liquids (eg alcohol) be purchased in the smaller duty-free shop after US pre-clearance just before boarding? Pointwise convergent and total variation I'm preparing for a test for real analysis and I came across this problem in Royden's book:  Let $\{f_n\}$ be a sequence of real valued functions on $[a,b]$ that converges pointwisely on $[a,b]$ to the real valued function $f$. Show that $TV(f) \leq \liminf  ~TV(f_n)?$  This looks quite similar in form to Fatou's Lemma to me, but can't find any way to establish TV with integration, can anybody please help?  (TV is short for total variation)