studiot

That's a very good question Do you have a very good answer ? Why, ? Photons have no reduced mass.

Interesting. Here is a picture of the hunmidity meter next to my computer today at 73% It rarely falls below 60% here and is often offered as the reason why the Englishman has a high rate of respiratory disease. I can sympathise with the cough etc, mine is due to PND.

We are (all?) washing our hands etc more and doing so with chemicals we hope will degrade coronavirus. So would this lead to the demise of less resistant variants and development of those strains that are more resistant ?

[math]\begin{equation}\bar{A}^{\mu\nu}=\frac {\partial \bar{x}^{\mu}}{\partial x^{\alpha}}\frac {\partial \bar{x}^{\nu}}{\partial x^{\beta}}A^{\alpha \beta}\end {equation} [/math] math]\begin{equation}\bar{A}^{\mu\nu}=\frac {\partial \bar{x}^{\mu}}{\partial x^{\alpha}}\frac {\partial \bar{x}^{\nu}}{\partial x^{\beta}}A^{\alpha \beta}\end {equation} [/math Your LaTex works just fine, but you need to put it between [math] [/math] brackets as shown. I have taken off the first and last square brackets to show how. Also ScienceForums has a program glitch where you have to refresh you page in the browser after writing to be able see the result of the code. You may also like to use the size dropdown menu to force an increase in the font size as the site defaults to a very tiny one. There are also some other options I could suggest if you are interested. In its defence, however, this site is the only one I now that still offers super and subscript as standard, which is very valuable as markup is not then required. Sadly more advance mathematical formating such as fractions, is not directly available.

Righto, I stopped bothering with your posts since you asked about a lot of terminology in another recent thread of yours. When I offer stuff you di not answer. But I see some of those terms appearing here. Also, with respect, others have made this far too complicated. Probably because you have brought in a lot of unconnected material. Tangents were described and investigated about 2000 years before coordinate geometry and calculus were invented. They do not possess a slope as an inherent property. The meaning is very simple. In the plane geometry of Euclid. Take any line PQ - note in the geometry of Euclid a line means a straight line it does not mean a curve. Draw lines AB, CD, EF etc parallel to The original line OP and all in the same plane, so that they intersect various curves. I have shown this for two curves, a circle or closed curve, and an open curve. AB, CD, EF all intersect the circle at exactly 2 points. No more and no less. All these lines are called secants. You can see that as the sequence of parallel lines is drawn closer and closer to the bottom of the circle The distance between the two points of intersection become closer and closer together Until the line T1T2 intersects the circle in only one single point. The line T1T2 is called the Tangent to the curve at the point of intersection. You should draw some more lines like PQ but not parallel to it and convince yourself that each such sequence of lines has only one intersection point with the circle and that every point on the circle has such a tangent line associated with it. Now look at an open curve. You can see that a similar sequence of parallel lines only works like this if you are close enough to the point of single intersection. If you extend the curve and lines far enough you may find more than two points of intersection. But if you keep close enough there is a sequence of exactly two intersection points, narrowing down to a unique point of single intersection. Again the lines with two points of intersection are called secants and the line with one point only is called the tangent to the curve at that point. The idea of intersection - where and how lines curves and geometric ficures intersect plays a huge part in the geometry of Euclid and interestingly re-appears in more modern topology. It is a very simple but powerful technique. Note again that I have not needed to mention the word slope. Yes, in coordinate geometry tangents can have a slope but that is another story.

List your questions. For example: 1.... 2 ... 3 ... Since there is a clear question mark at the end of the quote, I take it as proof positive that you are refusing to discuss in good faith. All my questions so far have been thus properly identified with such a question mark and each time your responses have been either non existant to to a different question I did not ask. I find it particularly insulting when I explicitly said that I am not an expert on nuclear reactions and confined my questions to the geology, yet you called me a dunce and answered my geology questions in terms of nuclear reactions.

Then you need to get your geological statements correct. You still have not addressed a single one of my points or questions. This is now the third time of asking for those answers. Is it your normal practice on joining someone else's grouping to immediately defy their rules?

At last somethig you and I can agree on. But then you have not answered one of my questions or addressed one of my points. All your responses to me have been about other things.

+1

Interesting question although isn't there hydrogen about in/from water and hydroxides ? +1

Placer deposits are the result of erosion/weathering and subsequent transport and deposition to an accumulation in another location. There are several mechanisms available. But what does this have to do with the diamonds I referred to, particularly the Eurelia ones ? Do you have any figures that allow you to openly scoff at viscosity variation in very very high viscoscity materials ?

It is to me Please explain what you mean?

Thank you for your summary, it enables proper discussion to proceed. +1 I think there are three separate things involved here. Firstly the proposed fusion reactions/processes. I am not competent to assess these so I hope someone with better knowledge will comment further on these. Secondly the proposed geological results of such a process, suppose it was in action. We must ask the question how does your explanation stack up against more conventional explanations. 1) The Carpathian deep earthquakes. https://www.sciencedirect.com/science/article/abs/pii/S0040195108002473?via%3Dihub 2) Ultra deep diamond formation and subduction zones. Kimberly is not the only non subduction boundary place these are found. But how long do you think it takes for diamonds to form, and then be brought nearer the surface? Other finds have been in Brazil, Australia, and Africa, but all on the subducting margins beneath the ancient continent of Gondwana. 3) So whilst there may be legs in your process, is it necessary? That does not dismiss the process, just that it may yet be shown to be one of several.

If you are able to work with tensors you should be able to take a tensor and post here (not a link to something) a simple example of the alleged discrepancy.

Your own Bible gives the lie to that statement. Seems to me a pretty clear record of antisocial behaviour by the leaders gangsters? of the day. So you do want to tell a Mathematician what an equality is. Wow and goodbye.

Is this another attempt to bash mass production ? Suppose you wanted (to build) a house. Would you make all the bricks individually one at a time or would you think mass production might be advantageous ? Furthermore would you follow the brickmaking instructions in your Bible when you made them ?

Please don't try to tell a Mathematicain what a mathematical theorem or its proof is. Probably the most famous counterexample (do you know and understand this word ?) is "The triangle inequality" which is, by definition, not an equality and was known before Euclid. FYI there are many uses of such mathematical structures in Physcs, for instance the Second Law and The Uncertainty Principle.

Well to continue the themed answer. The OP asked about surfaces, and I was trying to put things into context. I have chosen the plane and hyperplane because their geometries are linear. The plane and hyperplane are perhaps the simplest surfaces. We can build shapes in n dimensions considering intersections of lines, and planes. So we have polygons in 2 dimensions, polyhedrons in three dimensions and n-polytopes in n dimensions. Polygons are constructed from lines of (n-1) ie 1 dimension, but exist in 2 dimensions. Polyhedrons are solid shapes with surfaces constructed from planes. Again (n-1) ie 2 dimensions, but existing is 3 dimensions. Polytopes are shapes whose surfaces are (n-1) flats, existing in n dimensions so a polyhedron is also a 3-tope with 2-flat surfaces. Having got this far we can generate geometry on these surfaces and hypersurfaces. This will be the familiar Euclidian Geometry, or Cartesian Geometry if we involve coordinates. So for instance triangles will have interior angles adding to 180 and areas equal to 1/2 base times height, that will not vary with position on the surface. When we come to curved surfaces equivalent triangles will not be so simple to handle. Also we can generalise polytopes to curved closed surfaces such as spheres and ellipsoids and more and even to more complicated object we call manifolds.

All agreed, but John, I'm disappointed, you didn't tell Bartholomew Jones (why do you have to have such a long name to write out ? ) about the Scottish verdict. In point of fact there are three increasing levels of proof required in an English prosecution ( and a different one for civil matters called the balance of probabilities). The Police require the lowest level of evidence to charge someone The Crown Prosecution service requires a higher level to take the case to court reflecting the likelyhood of a successful prosecution. The Court requires the ultimate beyond reasonable doubt for a guilty verdict. It is customary here for someone (usually Strange) to post the cartoon about peer review. I'm going to say +1 for being (I hope as well as appearing) open minded enough to ask a sensible question. In fact proof was not mentioned in you question. To proceed is not synonymous with to prove. In technical terms 'Theory' may include several 'Principles', which are the scientific equivalent of mathematical proofs. An axiom or principle is a statement offered without proof but in the knowledge that it is not known to be contradicted within the conditions of application. All too often the conditions part are forgotten, particularly in arguments (of the disagreement type). I have a great deal of sympathy with the point of view emboldened. For instance shoe manufacturers (or is it shoe retailers?) have stopped offering half sizes - which is very difficult for me as I am a half size. Definitely a retrograde development. Other clothing retailers do the same thing with other garments. But my point to you is that, once again your approach is an all-or-nothing (binary) approach to something which has a scale from good to bad or black to white with many many shades of grey in between. It is therefore possible to proceed too far in either direction away from a comfortable middle way. And the greed of some humans feasts on this to the detriment of all others.

What all 20 ? What subject are you studying that you do not know the answers to any of them ? How about your thoughts on question 17 ? Did you really not understand it ? This is simply a matter of common sense, although it contains some points of chemistry worth discussing I see that HOI and Chenbeier have done question 1 to death, it really is a chemistry question. +1 apiece.

Gosh you have got a lot of geometry and topology into this question. So there is a huge amount of terminology to master. Starting with the sequence of linear (= flat) objects point, line , plane, hyperplane ....... subsequent flat objects are also called hyperplanes or n dimensions or n-flats. point, zero dimensions line, one dimension plane, two dimensions hyperplane three dimensions, for more we do not distinguish further names just an n dimensional hyperplane. We can follow David Hilbert and build flat or Euclidian geometries of n dimensions using these. One of these objects of n dimensions divides or separates a space of (n+1) dimensions into two regions, both of (n+1) dimensions. So a point is a 0 dimension object that divides a line into two lines A line is a 1 dimensional object that divides a plane into two half planes A plane is a two dimensional object that divides 3 space into two regions (region is a respectable word for a subdivision of a space of any dimension) So the n dimensional object forms a boundary between the regions. Curved objects come later and involve more concepts and terminology, depending onif your interest is geometry or topology.

That's a heftly 7 inch lump of 1 inch rebar you have shown. It doesn't look stainless, which would offer good resistance to hydrochloric or sulphuric acids. But stainless rebar can look dull like that. It is not higly polished like cutlery. It looks more like standard high tenisle steel with the normal black oxide coating. The black oxide is what give cast iron its high corrosion resistance. You would have to expose clean metal to get the solution going. Even then, if it is a high silicon steel it might still be resistant. Why do you need to dissolve such a large amount ? Would some shavings not do ?

Flu vaccination in th UK starts in September and only the stragglers (like me) are left until December. I got mine in early this year at the end of November. I never notice any change after the vaccination , but my wife always feels 'off colour' for a few days and needs at least some paracetamol. We both still do it though since neither of us has had the infection for years. I'm equally sure it would be wrong to pretend that there will not be a range of reactions to the covid vaccine and that many will notice some mild effects. Absolutely sure this this far outweighed by the benfits like a ton to an ounce. As to whether the Pfizer vaccine is dead virus or fragments of virus is a bit of a pointless argument. If I gut and fillet a dead fish for the table, it is still a dead fish (but with bits missing). If I hold a hog roast the thing turing on the spit over the firepit in the garden is still a dead pig (but with bits missing). But if I put a loin joint of pork in the oven, that is fragment of pig. I understand the difference between the Pfizer and Oxford vaccines are the difference between my fish or hog roast and sticking the legs off a pig onto a turkey.

There have been more than 2 in the UK alone, and these were for the dose 1 stage only as no dose 2 stages doses have yet been dispensed. However the incidence and range of reaction is incredibly low compared to that of the normal annual flu vaccination. I can't speak for anywhere else as I have no information there. Possibly those in Scotland were not as severe, certainly no one has failed to recover from them.

Vaccination hasn't reached us lowly peasants yet, so this is the best I can do. https://www.bbc.co.uk/news/entertainment-arts-55315802