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While his paper focuses on the heat equation on networks, given Neumann boundary conditions instead of Dirichlet, the eigenvalues of the heat equation are given to be constant μ such that

2 u x 2 = μ u

Since μ has to be less than or equal to zero in order for a solution to the heat equation, the eigenvalues of the heat equation are the squares of the eigenvalues of the wave equation

2 u x 2 = λ 2 u

Therefore, taking the square roots of the eigenvalues μ , we can recover the eigenvalues of the wave equation on our network. For the rest of our stated examples, the eigenvalues mentioned are assumed to be eigenvalues of the wave equation.

Von Below studies the network heat equation with Neumann conditions at the endpoints

u j t = a j 2 u j x j 2

where u j is the temperature of the j th edge, a j is the positive diffusion coefficient of the j th edge, and x j [ 0 , j ] is position on the j th edge, which has length j . The notation is the same as the notation with which the network wave equation was described.

By defining simply a set of nodes and connections between them, Von Below calculates the eigenvalues and eigenmodes of a network with the help of spectral graph theory (a study of the connections between a graph and the eigenvalues of its adjacency matrix). The eigenvalues of the heat equation on networks of strings progress according to several different patterns, some of which are common to every network, some of which are network-specific and dependent on the eigenvalues of the network graph's row-normalized adjacency matrix.

For nonspecific parameter values, the best we can hope to do is to solve a transcendental equation for our eigenvalues. For specific parameter values, such as when a j = j 2 , we can solve analytically for both the eigenfunctions and eigenvalues of the heat equation, breaking both down into cases. There are, in general, 5 total classes into which eigenpairs of the heat equation on a network can be organized, with each network having at most 4 classes applicable to it.

The tritar's eigenvalues sorted by cases
The tritar's eigenvalues sorted by magnitude. These eigenvalues of the tritar are calculated via Von Below's methods. For each eigenvalue case, there exist an infinite number of eigenvalues

For each one of these classes mentioned, there is an infinite number of eigenvalues associated with it. Organizing the progression by k instead of by magnitude gives more insight into the nonlinear progression of our network eigenvalues - there is a clear bifurcating/splitting patten of the eigenvalues as k increases. As the progression of eigenvalues splits into two separate patterns, each pattern is linear with different rates.

The fundamental difference here is that the eigenvalues for the one dimensional transverse network wave equation progress with two different rates. While there are two distinct sets of eigenvalues for our three dimensional string, to have eigenvalues progressing at different rates for one dimensional transverse string motion is atypical. This isn't a complete explanation for the irregular progression of the eigenvalues for the three dimensional wave equation; however, it does offer some clues as to the nonlinear ordering of those eigenvalues.


Thanks to Jeremy Morell, whose work I built upon, as well as Robert Likamwa, who helped nail down a lot of details concerning visualization and graphics. Thanks to Dr. Cox and Dr. Embree for their guidance their trust that I could actually do something with the project they gave me.

This work was partially supported by NSF DMS Grant 0240058

Questions & Answers

more explanation on GDP
Isaac Reply
it is a country total out put of goods and services divided by the total population of the country.I think it can also be derived from the country labour force,,because it mostly depend on the labour force and the level of technology .
labour force and technological progress leads to greater production increases the GDP
What is economics?
Bubu Reply
by this time
It is a social science that analyses production,distribution and consumption of goods and services
A social science that study human behavior in relationship with decision making
What are the typical patterns of GDP for a high-income economy like the United States in the long run and the short run?
mwangala Reply
What are the limitation and significant of macroeconomic
Usman Reply
explain the significance of concerpt of opportunity cost in planning
Mwanaid Reply
what is meant by the price elasticity of demand?
Martine Reply
when price of a commodity increase it's demand contracts , and whe the price of a commodity decreases it's demand expands so the degree of change in demand in response to change in own price of the commodity is called PED . Ed = percentage change in quantity demanded / percentage change in price
What are the limitations of macroeconomic and their segnificant
Usman Reply
Discuss the role of competition in stimulating economic growth?
Daniel Reply
competition stimulate economic growth because in such types of economy,they is no monopoly power every supplier will want to produce to meet customers choice which brings about quality production and attract invested and customers into such economy
competition creates Monopoly because of economy of scale. it's not antithesis but different side of same coin
competition result in high economic growth since every firm will intend to provide quality services and products to meet customers needs and requirements unlike in Monopoly situation where a firm just provide what it want to resulting in large stock piles of unwanted products ,ie inefficiency, howev
microeconomics study part of the economy but macroeconomic study the whole economy
Olokun Reply
studying the whole economy, solving the problem of the economy and building up the economy
micro means small while macro means large
standard of living is the footsteps of an economy because it plays important role for country to have crucial view about their budget ,import and export
it will be differ because economic agent will only take their views on some part of household
can opportunity cost be zero
OBED Reply
how many types of transportation do we have
yes. when a customer's purchasing power is high, he may have d ability to purchase all he needs, dt makes opportunity cost zero
please can give more explanation on this question
what are the factors production
Labour capital entrepreneurs
Land,capital, labour,and the entrepreneur
I will like to know use of calculus in economics
do they use it in economics?
I want to know if I should take calculus or statistics and probability my senior year of highschool
yes for example in monopolistic competitive market..... TR=TC* & THIS CALCULATED BY CHANGING( DERIVATIVE LAW) MR =MC ** WILL BE THE FORMULA THAT USE.
please in which topic in economic is the question coming from.
from PCF in economics
why is unitary proportional to responsiveness
Etim Reply
any tip for igcse economics exam?pls
Stacey Reply
What is a market
Divine Reply
what are the variables that affect demand
what are the variables that affect demand
what are the variables that affect demand
what are the variables that affect demand
what are the variables that affect demand
price of the related goods 2 price of the given commodity 3 income of the consumer 4 taste and preference 5 expectation in the future price
pls the taste and preference
explain briefly
a consumer taste and preference commodity changes for a time the man becomes
sorry sorry
is when the price of a commodity becomes high and can't afford example Samsung instead of iPhone
consumers who have high intense for goods will purchase the goods even if the price of that commodity increases because he or she preferred that commodity.people will be prefer iphone as its price increase
as usual bad taste of preference is when a consumer regrets from one commodity to another in terms of the price
thanks alot
you're welcome
#Preference; #Income #Test
#price Of Commodity #Income #Taste #Preference
#Market is The Place Where Buyers And Sellers Are Exchanging Their Goods And service. #
difference between macro and micro economics
Microeconomic Study about individual consumers market But Macroeconomis Study General economic Process Such As #Aggregate Demand #Aggregate Supples #GDp= #GNp
nice so can u run down a brife discussion on GDP
Researchers demonstrated that the hippocampus functions in memory processing by creating lesions in the hippocampi of rats, which resulted in ________.
Mapo Reply
The formulation of new memories is sometimes called ________, and the process of bringing up old memories is called ________.
Mapo Reply
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Source:  OpenStax, The art of the pfug. OpenStax CNX. Jun 05, 2013 Download for free at http://cnx.org/content/col10523/1.34
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