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by Paul
February 13th, 2020, 7:15 pm
Forum: Numerical Methods Forum
Topic: About solving a transport equation
Replies: 156
Views: 52992

Re: About solving a transport equation

Cat [$]\in[$] pigeons:

Jump conditions

Weak solutions

Multiply 3(A) by any power of u and write in conservation form
by Paul
February 13th, 2020, 7:09 pm
Forum: Off Topic
Topic: Impending Birth - Not Being Present
Replies: 174
Views: 8898

Re: Impending Birth - Not Being Present

I remember British actor Roy Kinnear dying. There’s a UK newspaper with a regular column by a quadriplegic ex rider. Not much fun to read.

Riding seems to come with overconfidence. That’s not good.
by Paul
February 13th, 2020, 6:30 pm
Forum: Off Topic
Topic: Impending Birth - Not Being Present
Replies: 174
Views: 8898

Re: Impending Birth - Not Being Present

Driving does not meet the conditions for the CDT.
by Paul
February 13th, 2020, 6:13 pm
Forum: Off Topic
Topic: Impending Birth - Not Being Present
Replies: 174
Views: 8898

Re: Impending Birth - Not Being Present

Riding is v dangerous. Badly fails my Celebrity Death Test.
by Paul
February 13th, 2020, 4:30 pm
Forum: Numerical Methods Forum
Topic: About solving a transport equation
Replies: 156
Views: 52992

Re: About solving a transport equation

I don't have any fresh viewpoints! I'm just regurgitating some basic things I learned 40 years ago!
by Paul
February 13th, 2020, 4:19 pm
Forum: Off Topic
Topic: How good or bad are the pandemic warning models?
Replies: 294
Views: 56138

Re: How good or bad are the pandemic warning models?

These models tend to have similar shapes. S shaped for total number of deaths, i.e. a peak in death rate. But which is the right model since they all look the same? Until yesterday I had an incredible fit for a simple model based on tw's " I wonder if  one can solve the basic model with simple time-...
by Paul
February 13th, 2020, 5:48 am
Forum: Student Forum
Topic: Silly questions
Replies: 94
Views: 14902

Re: Silly questions

Well, if we are going to be so literal, then since the original post did not want an answer but a vote I am going to vote yes!! This is maths 21st century style!
by Paul
February 13th, 2020, 2:04 am
Forum: Student Forum
Topic: Silly questions
Replies: 94
Views: 14902

Re: Silly questions

But we do now know that the answer to Cuch's question is no!
by Paul
February 13th, 2020, 2:03 am
Forum: Student Forum
Topic: Silly questions
Replies: 94
Views: 14902

Re: Silly questions

The named function just happens to be the answer!

Exam question 1: Find the solution of ...

Answer: Define [$]\mbox{Lewis}_1[$] as the answer to question 1. Trivially and wlog the answer to question 1 is [$]\mbox{Lewis}_1[$].

Exam question 2: Etc.

!!!
by Paul
February 13th, 2020, 1:28 am
Forum: Student Forum
Topic: Silly questions
Replies: 94
Views: 14902

Re: Silly questions

That looks a bit circular to me!
by Paul
February 12th, 2020, 11:36 pm
Forum: Off Topic
Topic: How good or bad are the pandemic warning models?
Replies: 294
Views: 56138

Re: How good or bad are the pandemic warning models?

Spot which of the below are not seeking more funding:  I hope this outbreak may be over in something like April Prof. Nanshan Zhong Leading epidemiologist, first to describe SARS coronovirus Feb. 11, 2020  It could infect 60% of global population if unchecked Prof. Gabriel Leung Expert on coronaviru...
by Paul
February 12th, 2020, 11:25 pm
Forum: Off Topic
Topic: How good or bad are the pandemic warning models?
Replies: 294
Views: 56138

Re: How good or bad are the pandemic warning models?

The Dalai Lama has cancelled events in response to Covid19. 

Is this peak hysteria? If it is then that probably coincides with peak death rate.
by Paul
February 12th, 2020, 10:38 pm
Forum: Student Forum
Topic: Silly questions
Replies: 94
Views: 14902

Re: Silly questions

Via gamma fn, looks messy!
by Paul
February 12th, 2020, 7:12 pm
Forum: Off Topic
Topic: How good or bad are the pandemic warning models?
Replies: 294
Views: 56138

Re: How good or bad are the pandemic warning models?

It's a simple change of parameter!
by Paul
February 12th, 2020, 6:13 pm
Forum: Numerical Methods Forum
Topic: About solving a transport equation
Replies: 156
Views: 52992

Re: About solving a transport equation

1) You like transforming coords. So change to coords that move with the chars.

Or

2) Constrain dy and dt so that you solve numerically along the chars. That’s what I’ve used in the past.
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