Could you please provide me a teaching, research, or editorial position in mathematics?

Dear Sir/Madam Could you please provide me a teaching, research, or editorial position in mathematics? You can find my details at https://qifeng618.wordpress.com. When you have any information,...

09 October 2018 9,504 2 View

What and where is the inverse of a concrete lower triangular matrix?

Dear All Could you please tell me what and where the inverse of a concrete lower triangular matrix showed in the picture is? Can you help compute the inverse matrix explicitly? Best regards...

10 November 2017 9,115 13 View

How to compute the inverse of a special matrix?

How to compute the inverse Anxn-1 of the matrix Anxn? For details of the matrix A, please see the picture uploaded with this message. It is better to find a reference in which this problem was...

11 December 2016 4,481 43 View

Can one give a general formula for the product of three different finite sums?

Can one give a general formula for the product of three different finite sums? See the picture attached with this question.

09 October 2016 5,240 14 View

Could you please help prove two integral inequalities in the picture uploaded?

Dear All Could you please help prove two integral inequalities in the picture uploaded to this message? Best regards Feng Qi (F. Qi) https://qifeng618.wordpress.com

08 September 2016 8,553 11 View

How to compute a special Hessenberg determinant below?

How to compute a special Hessenberg determinant showed by the PDF file? Thank a lot.

31 December 2015 5,197 5 View

What is the name of the matrix or determinant showed by the picture?

What is the name (for example, Vandermonde determinant) of the matrix or determinant showed by the following picture? I believe that it should have a name, but I am not sure.

11 December 2015 9,053 9 View

What is the formula for the Bell polynomials of the second kind?

My question is expressed by the picture below. May you provide me a formula and a reference to cite? Thank a lot.

04 May 2015 9,957 4 View

Where can I find the integral analogue of Cauchy-Binet identity?

07 August 2014 8,988 13 View

Ask for electronic copies of five papers pressed and issued in Singapore

06 July 2014 6,499 1 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View