studiot

I don't misunderstand anything., but thank you for the kindergarten picture. Instead of preaching at me I recommend you ask what I mean if you really don't know. But I suppose as you are not a Chemist you might not.

Although this is true of most measurements, it is just not true of all measurements. In particular it is not true of one of the most important SI measurements.

Thank you. So waht is the field variable and what are its units ? Note the EM 'field ' is not one field but two, with two field variables. Out of interest what do you think a field is ? You seem to be using some form of the physics definition, which is quite different from the Mathematics def. I can't agree with this. Spacetime (due to Minkowski, not Einstein) is not a field by either definition. I should be careful of using the word smooth. Smooth has a particular meaning indifferential geometry and function theory, that is very important to this subject, as it is what permits the use of calculus.

Agreed, but note that Tex failure has yet to be fixed.

Hello and welcome as I see you are new here. A couple of words before I address your idea. This forum (SF) has just migrated fro its former host and at the moment many things are topsy-turvey. Some things are working properly some are not and the admins are working hard to correct this. Theoretically a new member is limited to 5 posts in their first 24 hours as an anti spam measure, but I don't know if that is operational. So use your replies wisely. Secondly rule 2.7 requires enough summary for discussion to take place within SF so if you want folks to bite then don't try to send them off site to a link. So I suggest you post a summary of what exactly you mean by a temporal field since you have included space in this definition.

OK so I have thought, (sorry my thought processes are so slow at the moment) To do this without a ruler ie with only a pair of compasses you can follow the inscribing a regular hexagon inside a circle, but only mark the hexagon points, not the sides. So 1 ) Centre B draw circle radius BA 2) Leaving compasses set to BA, step off 3 intersection marks round circle from A , and 3 intersection marks going the other way for a check. 3) Find point C on third intersection both ways round.

One thing you can do to find out who is being quoted is to click on the shadow arrow on the right hand side of the quoted passage. Sorry my screenshot looses my cursor when I take it.

Yes of course it is possible to reach a conclusion in the way you subsequently defined. That is a particularly useless, possibly misleading situation since that conclusion may still be flawed. I have already given an example of this, which you have not replied to.

My brother in law is allergic to cats so that he won't enter a house with cat(s), but fine with dogs and has two of his own. His mother was allergic to dogs, but not cats and had one of her own. So which is better ? Stupid unanswerable question if you ask me.

Nearly the only useful information on the home page at the bottom right hand corner compared to one of those empty picture holders. The useful things being the who's online list and the clickable all activity (one click instead of two from that diminutive tab at the top)

Trading rivalry is probably the largest casus belli in history and goes back as far as history itself.

Nothing has reached me boss.

Who is will self ? Have you ever heard of 'ragdoll cats' ? These have more the 'doglike' characteristics you mention. For instance you can take them for a walk. https://en.wikipedia.org/wiki/Ragdoll

[math]r = \sqrt {\frac{{78.5}}{\pi }} \simeq \sqrt {\frac{{78.5}}{{\sqrt {10} }}} = \sqrt {\frac{{7.85*10}}{{\sqrt {10} }}} = \sqrt {7.85*\sqrt {10} } = 4.98[/math] [math]\left[ {\begin{array}{*{20}{c}} {{E_1}} \\ {{E_2}} \\ {{E_3}} \\ \end{array}} \right][/math]

Well I don't want to clog up this thread but I couldn't find a way to start my own comment thread. So 1) Notifications, messages and activity list successfully migrated. 2) Login now demands and email address. I really had to scratch my head to find a suitable one. 3) The create table option in the input editor looks good. I will try it out at the next op. Hope it will be so much better than doing it with Tex. 4) Earlier versions used to display what an online user was doing. I found that very helpful in discussion, sometimes, Can it be recreated ? 5) I'm glad to see that the super/sub script options still there, even if it is now two clicks away instead of one. 6) The insert line before quote is really useful, I have often want that on the old one. Haven't yet tried to quote selected text. Can't seem to delete the whole quote though, again a useful thing to do sometimes.

Not convinced. Trump is a bully by nature and bullies like threats rather than action as the ation can only happen once, whereas threats can go on forever. Moving military hardware into position is initially a threat, it does not mean it will be used. Unlike Putin, who want to annex a target, China has used such threat to good (for them) effect for a while now in their sphere of influence.

Thanks. I'll watch this space with interest.

Perhaps favourite responses are because there isn't a one-method-fits-all approach as not all wallpapaers are born equal. So the first task, before stripping, is to determine the type and nature of the 'wallpaper'. In some countries, particularly in Europe (not the UK), it is common to take the wallpaper with you when you move. So obviously the stripping method cannot involve damage to the paper. Indeed special 'strippable' papers are marketed in these countries. Moving on some wallpapers (including the UK) are placed over lining paper or some other lining material such as 'cotina' for either extra insulation or damage concealment or anti-damp or all three. Again obviously you may not want to damage the underlying layer. As already noted, not all glues are the same either. Traditional UK glue is based on plant starch for relative ease of subsequent stripping, but may encourage mould and mildew in damp conditions. More recently modern glues have been available, some designed for ease of stripping, some for the opposite. The paper itself also makes a difference. Modern vinyl wallpaper is impervious to water and often even to steam so iNow's comment about scarrifying the wall is appropriate. Finally, love the pics @Sensei +1.

Good morning, David. You are very welcome if you have anything useful to discuss or can add anything useful to any existing discussion. It is discussions that are classified in sections, not members; members can access all sections. There are several engineers, and retired engineers here. The official introduce yourself thread is here: Perhaps a moderator would be kind enough to move it there. Please note that in your first 24 hours you are limited to 5 posts as an antispam measure.

This thread is growing ever more Terry Pratchett and ever less sf/home/sciences/physics/relativity. I sem to remember discussing the speed of light in vacuuo, backalong. What, pray, is the speed of sound in vacuuo ?

Lots of goals, but which side scored them ?

WAT (wall of text) luckily the 5 post rule will soon intervene.

So what Other Science are we fitting this dream into ?

Did you actually have anything to discuss here or is it just the weed talking ? You are correct in that Truth in maths has a different meaning from Truth in other disciplines, such as religion or politics and fyi it does not appear at all in Science. Your are incorrect in that maths is neither a language nor a conversation, though there are mathematical models of language. You need to focus this thread quickly before it either withers on the vine through exhaustion or is closed in disgust by the moderators.

The most important piece of knowledge for someone with a PhD is the limit of their own knowledge. That this is so in economics was brought to poignant focus when the concensus of PhD folks brought about the crash of 2008 due to failure to understand the Black-Scholes equation and its assumptions and limitations.