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drdawud

@drdawud

Expat, engineer, educator, and writer

113 followers 5 following 103 posts Reputation 42.77

drdawud
@drdawud May 30, 2018, 12:17 AM UTC

I'm back - An update

As some of you know, I was teaching and coaching a math team. This took up a significant amount of my time and energy and I wasn't able to update as much as I wanted. The semester recently ended but…

1 upvotes 2 replies $0.00
drdawud
@drdawud Apr 21, 2018, 3:37 PM UTC

Regarding the Geometric Meaning of Determinants

Hello steemians, it's been a very busy two weeks for me. It was midterm week, which meant creating and grading midterms; then we were sponsoring a Math Olympiad, which meant organizing some 80-odd el…

13 upvotes 2 replies $0.08
drdawud
@drdawud Apr 9, 2018, 2:57 PM UTC

A Song of Iraq

I composed this poem in 2012, during the Iraq war. At that that time, it bore the subtitle «رسالة إلى باراك أوباما» ("A Letter to Barack Obama"), and I dedicated it to those who had been displaced by…

4 upvotes 2 replies $0.01
drdawud
@drdawud Apr 9, 2018, 8:20 AM UTC

Finding the height of a Sea Island: A 1800-year old math problem

In a previous post, I wrote about how ancient surveyors attempted to find the height of a sea island. Keeping in mind, this was largely before the advent of trigonometric tables, the methods they dev…

6 upvotes 0 replies $0.41
drdawud
@drdawud Apr 7, 2018, 1:45 PM UTC

Puffin beaks glow when exposed to ultraviolet light

British ornithologist Jamie Dunning at the University of Nottingham in England has shown that puffins have beaks which fluoresce under ultraviolet (UV) light. Dunning discovered that the the cere and…

5 upvotes 0 replies $0.01
drdawud
@drdawud Apr 6, 2018, 11:10 AM UTC

Poema: El Ultimo Viaje (con traduccion)

¡Mis queridos soldados! Ya hemos llegado al cabo – Juntos compartamos un vino. Después de decir adiós, Déjenme dormir en paz Para cuando despierte Y vea la luz radiante. Que sea de nuevo vencedor! O…

2 upvotes 0 replies $0.00
drdawud
@drdawud Apr 5, 2018, 9:33 AM UTC

Finding the Height of a Distant Island: Can you solve this 1800-year old math problem?

I'm still officially on vacation, but I thought I'd post anyways today. For Chinese-speaking communities around the world, today is the Qingming Festival, or the "Tomb Sweeping Festival". On this day…

6 upvotes 1 replies $0.04
drdawud
@drdawud Apr 1, 2018, 1:36 AM UTC

Associativity in Tropical Set Theory

Today I wanted to do something a bit different and do something more advanced. I usually blog about high school and undergraduate math, but as I'm on spring break, and I have a bit more time to spend…

80 upvotes 3 replies $0.61
drdawud
@drdawud Mar 30, 2018, 2:16 AM UTC

Solutions to Geometry Questions

Several days ago, I made a post about two simple geometry questions. Here I present my solutions: Question 1: Given that CF = FD and that , what fraction of square ABCD does occupy? Solution 1 Place…

1 upvotes 3 replies $0.01
drdawud
@drdawud Mar 29, 2018, 5:32 PM UTC

The nth root of complex numbers

The modulus of the Pearcey Integral Function. Source: https://dlmf.nist.gov In the previous post, we showed that any complex number to an integer power can be expressed as: Where r is the modulus of…

76 upvotes 1 replies $0.39