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1∞=0
A statement the limit concept,
limx→∞1x=0
limx→0+1x=∞
0+ :from the positive side of the real line.
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Version : 09/06/2013
This is a mathematical equation for an unknown function of one or several variables that relates the values of the function itself and its derivatives of varous orders.It play a prominent role in engineering, physics, economics, and other disciplins.
E=MC2
Where:\
E = Energy\
m = mass\
c = speed of light
Einstein's field equations
Gμν≡Rμν−12Rgμν≐8πGc4Tμν
Last theorem of Pierre de FERMAT
Xn+yn=zn
Equation and constant of Ludwig BOLTZMANN
S=klogeWk=RNa
In quantum statistical mechanics, th H-function is the function:
H=∑iPilnpi
The Max PLANCK Constant
E=hνBλ(T)=2hc2λ51ehcλkBT−1
Where : \
λ : wavelength \
B : spectral radiance of th black body, \
T : absolute temperature, \
v : frequency of the emitted radiation \
KB : Boltzmann constant \
h: Planck constant \
c : Speed of light
Niels BOHR Atom Model
1λ=RH(122−1n2)forn=3,4,5,...
RZ=2π2meZ2e4h3
Where:
me = the electron's mass
e = electron's charge
h = = Planck's constant
Z = atom's atomic number (e.g. 1 for Hydrogen)
Quantum Mechanics
See KB Physics 'What Is Quantum Mechanics?'
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Uncertainty principle
One consequence of the basic quantum formalism is the uncertainty principle. In its most familiar form, this states that no preparation of a quantum particle can imply simultaneously precise predictions both for a measurement of its position and for a measurement of its momentum. Both position and momentum are observables, meaning that they are represented by Hermitian operators. The position operator
X^
and momentum operator
P^
do not commute, but rather satisfy the canonical commutation relation:
- [X^,P^]=iℏ
Given a quantum state, the Born rule lets us compute expectation values for both
X
and
P,
and moreover for powers of them. Defining the uncertainty for an observable by a standard deviation, we have
- σX=⟨X2⟩−⟨X⟩2,
and likewise for the momentum:
- σP=⟨P2⟩−⟨P⟩2.
The uncertainty principle states that
- σXσP≥ℏ2.
Either standard deviation can in principle be made arbitrarily small, but not both simultaneously. This inequality generalizes to arbitrary pairs of self-adjoint operators
A
and
B
The commutator of these two operators is
- [A,B]=AB−BA,
and this provides the lower bound on the product of standard deviations:
- σAσB≥12|⟨[A,B]⟩|.
Another consequence of the canonical commutation relation is that the position and momentum operators are Fourier transforms of each other, so that a description of an object according to its momentum is the Fourier transform of its description according to its position. The fact that dependence in momentum is the Fourier transform of the dependence in position means that the momentum operator is equivalent
up to an iℏ factor
to taking the derivative according to the position, since in Fourier analysis differentiation corresponds to multiplication in the dual space. This is why in quantum equations in position space, the momentum
Pi
is replaced by
iℏ∂∂x,
and in particular in the non-relativistic Schrödinger equation in position space the momentum-squared term is replaced with a Laplacian times
−ℏ2
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The time evolution of a quantum state is described by the Schrödinger equation:
- iℏddtψ(t)=Hψ(t)
The solution of this differential equation is given by
ψ(t)=e−iHt/ℏψ(0)
Information Theory
Information theory is based on a measure of uncertainty known as entropy (designated “H”). For example, the entropy of the stimulus S is written H(S) and is defined as follows:
H(S)=−∑sP(s)log2P(s)
Qubit Concept
It might, at first sight, seem that there should be four degrees of freedom in {\displaystyle |\psi \rangle =\alpha |0\rangle +\beta |1\rangle \,}, as {\displaystyle \alpha } and {\displaystyle \beta } are complex numbers with two degrees of freedom each. However, one degree of freedom is removed by the normalization constraint |α|2 + |β|2 = 1. This means, with a suitable change of coordinates, one can eliminate one of the degrees of freedom. One possible choice is that of Hopf coordinates:
- α=eiψcosθ2,β=ei(ψ+ϕ)sinθ2.
- Additionally, for a single qubit the overall phase of the state ei ψ has no physically observable consequences, so we can arbitrarily choose α to be real (or β in the case that α is zero), leaving just two degrees of freedom:
- {\displaystyle {α=cosθ2,β=eiϕsinθ2,}}
where {\displaystyle e^{i\phi }} is the physically significant relative phase.
The possible quantum states for a single qubit can be visualised using a Bloch sphere.
Mathematics is the abstract study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics.
Mathematicians seek out patterns (Highland & Highland, 1961, 1963) and use them to formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proof. When mathematical structures are good models of real phenomena, then mathematical reasoning can provide insight or predictions about nature. Through the use of abstraction and logic, mathematics developed from counting, calculation, measurement, and the systematic study of the shapes and motions of physical objects. Practical mathematics has been a human activity for as far back as written records exist. The research required to solve mathematical problems can take years or even centuries of sustained inquiry.
None of this is entirely wrong, but it is also not satisfactory. Let us just point out that the fact that there is no agreement about the definition of mathematics, given as part of a definition of mathematics, puts us into logical difficulties that might have made Gödel smile...
Mathematics at MIT is administratively divided into two categories: Pure Mathematics and Applied Mathematics. They comprise the following research areas:
Pure Mathematics
Algebra & Algebraic Geometry
Algebraic Topology
Analysis & PDEs
Geometry
Mathematical Logic & Foundations
Number Theory
Probability & Statistics
Representation Theory
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Applied Mathematics
In applied mathematics, we look for important connections with other disciplines that may inspire interesting and useful mathematics, and where innovative mathematical reasoning may lead to new insights and applications.
Combinatorics
Computational Biology
Physical Applied Mathematics
Computational Science & Numerical Analysis
Theoretical Computer Science
Theoretical Physics
Electromagnetic Spectrum

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