Posts by tullio


log in
1) Message boards : Science (non-SETI) : Philosophy (Message 1705663)
Posted 10 hours ago by Profile tullioProject donor
I shall not write any longer. Never spoke of D/Dt. DD for me is an operator to download files in UNIX..
Tullio
2) Message boards : Science (non-SETI) : Philosophy (Message 1705642)
Posted 10 hours ago by Profile tullioProject donor
d/dt means nothing to mathematicians.
It's not a differential operator. "*" is an operator.
dv/dt and dm/dt are factors in an equation.
Factors are a mathematical term for a component in a multiplication.

dv/dt and dm/dt are not divisions. In a different notation you could use a dot above v and above m to signify they are derived with respect to time.Operators are commonly used in quantum physics. They form Lie algebras.
Tullio
Mathematical foundations of quantum mechanics, by George W. Mackey, W.A.Benjamin, 1963, pag. 10
d/dt f(a+tv) = lim f(a+tv) -f(a)/t t->0
Note the d/dt operator
3) Message boards : Science (non-SETI) : Philosophy (Message 1705628)
Posted 11 hours ago by Profile tullioProject donor
d/dt is a differential operator which operates on a function, in our case the product mv.
Tullio
4) Message boards : Science (non-SETI) : Philosophy (Message 1705591)
Posted 13 hours ago by Profile tullioProject donor
Let's call it a Linear Vector Algebra It is the theory of Linear vector spaces, such as Banach spaces, which have a norm (a kind of distance) and are complete, that is a Cauchy succession always includes a point in that space. A Banach space becomes a Hilbert space if it has a scalar product, besides a vector product. All equations of Quantum Theory use Hlibert spaces (See "Quamtum Mechanics" by P.A.M.Dirac or "La mecanique quantique" by Albert Messiah). Hilbert vectors can be projected in energy-momentum spaces and become the Schroedinger eigenfunctions, more easily understandable since they are wavefunctions. Chemists call them "orbitals" since they define the possibile "orbits" of electrons in atoms and molecules. A molecular orbital is often defined as a Linear combination of atomic orbitals, and is calculated by computers using various approximate methods, such as Hartree-Fok and density functional theory.
Tullio
5) Message boards : Science (non-SETI) : Philosophy (Message 1705581)
Posted 14 hours ago by Profile tullioProject donor
I have followed four math courses, Analysis 1,Analysis 2,Analytical Geometry, Analisi Superiore. My Thesis was based on Lie Group theory and employed non compact Lie Algebras such as SU(N,1). It was published on IL Nuovo Cimento in September 1967.
Tullio
6) Message boards : Science (non-SETI) : Philosophy (Message 1705561)
Posted 15 hours ago by Profile tullioProject donor
I simply apply the rules of derivation to a product of two variables. My equation is exact, ask any mathematician.
Tullio
7) Message boards : Science (non-SETI) : Philosophy (Message 1705543)
Posted 17 hours ago by Profile tullioProject donor
I said I used Newton dynamics, leaving Einstein aside.
Tullio
8) Message boards : Science (non-SETI) : Philosophy (Message 1705538)
Posted 17 hours ago by Profile tullioProject donor
Read Bernard d'Espagnat "A la recherche du reel, Le regard d'un physicien", 1981, Bordas, Paris.
Tullio
9) Message boards : Science (non-SETI) : Philosophy (Message 1705534)
Posted 18 hours ago by Profile tullioProject donor
F=dp/dt.p(momentum)=mv. So F = mdv/dt + vdm/dt. This is the case of a rocket whose mass changes because the fuel is being burned. So F is not simply ma (a acceleration). This in Newton dynamixcs.
Tullio
10) Message boards : Cafe SETI : Italian cafe (Message 1705528)
Posted 18 hours ago by Profile tullioProject donor
Giro to Contador, Tour to Froome, Vuelta to whom? Place your bets. Mine is Fabio Aru.
11) Message boards : Science (non-SETI) : Philosophy (Message 1705460)
Posted 22 hours ago by Profile tullioProject donor
It wa Enrico Fermi and his group in Rome to split the uranium nucleus with slow neutrons, but they did not recognize what they had done. God in His wisdom, made us all blind, said Emilio Segre'. It was a woman, Ida Noddack, a Czek chemist, to understand what Fermi had done but she was not believed. Then Lise Meitner and Otto Hahn gave the correct interpretation of Fermi's result and they were believed.
Tullio
12) Message boards : Science (non-SETI) : Philosophy (Message 1705271)
Posted 1 day ago by Profile tullioProject donor

I suppose that pure mathematicians get all huffy and bent out of shape when someone dares to apply their beautiful, abstract creations to useful purposes.

"Here's to pure mathematics ; may it never be of use to anybody." Anonymous

I know this toast of Cambridge Cavendish Laboratory (1897):
To the electron; may it never be useful to anybody!
Tullio
13) Message boards : Science (non-SETI) : Philosophy (Message 1705255)
Posted 1 day ago by Profile tullioProject donor
My logic masters, Ludovico Geymonat, Corrado Mangione, Pier Giorgio Odifreddi insist that logic is not a subset of mathematics but a discipline of its own. I agree with them.
Tullio
14) Message boards : Science (non-SETI) : UK Power Supplies (Message 1705253)
Posted 1 day ago by Profile tullioProject donor
All my computers are conected to a "ciabatta" (sabot) which eliminates voltage fluctuations. Not an UPS.
Tullio
15) Message boards : Cafe SETI : Italian cafe (Message 1705245)
Posted 1 day ago by Profile tullioProject donor
Hungaroring Grand Prix
1 Sebastian Vettel Ferrari
2 Daniil Kvyat Red Bull
3 Daniel Ricciardo Red Bull
Hamilton and Rosberg slowed after a safety car. Raikkonen out for electric faults.
16) Message boards : Science (non-SETI) : UK Power Supplies (Message 1705210)
Posted 1 day ago by Profile tullioProject donor
One hot July Friday afternoon at Area Science Park in Trieste there was a blackout, stopping all computers. It resulted that the temperature in the UPS room had risen so much to trip a shutdown of the UPS. Prof. Carlo Rubbia was very upset and his secretary called me, a BULL employee, to ask for a explanation. I had to tell her that I had nothing to do with the AREA power equipment and that she would have to wait until next Monday for a repair. The air conditioning of the UPS room was reinforced.
Tullio
17) Message boards : Science (non-SETI) : Philosophy (Message 1705208)
Posted 1 day ago by Profile tullioProject donor
It was David Hilbert who tried to build mathematics as a consequence of Logic, followed by Bertrand Russell. Goedel destroyed this effort.
Tullio
18) Message boards : Science (non-SETI) : Philosophy (Message 1705197)
Posted 1 day ago by Profile tullioProject donor
Do I contradict myself? Very well, then I contradict myself.I am large, I contain multitudes! (Walt Whitman, "Leaves of grass").
This is pure Goedel who says that in a logic system powerful enough to include arithmetic, there are statements that cannot be proved either true or false.
Tullio
19) Message boards : Science (non-SETI) : Philosophy (Message 1705183)
Posted 1 day ago by Profile tullioProject donor
I would add Kurt Goedel and John (Jancsi) von Neumann.
Tullio
20) Message boards : Cafe SETI : Italian cafe (Message 1704927)
Posted 2 days ago by Profile tullioProject donor
Alpe d'Huez
1 Thibaut Pinot
2 Nairo Quintana
3 Ryder Hesjedal
Froome wins the Tour and the polka dot jersey
Nibali has had a broken tyre and loses abount one minute


Next 20

Copyright © 2015 University of California