Rizal (@rizal80) — Hive

drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #poem • 7 years ago
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…
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drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #science • 7 years ago
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…
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drdawud (42)in #poetry • 7 years ago
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.…
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drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #math • 7 years ago
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…
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drdawud (42)in #math • 7 years ago
The nth root of complex numbers
The modulus of the Pearcey Integral Function . Source: In the previous post, we showed that any complex number to an integer power can be expressed as: Where r…
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drdawud (42)in #politics • 7 years ago
One Continent: Europe's Future Goes Through Eurasia
Image source: wikipedia.org (public domain license) Note: This article was originally published by Thierry Vanroy in 2012. Mr. Vanroy is a Belgian political writer…
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drdawud (42)in #math • 7 years ago
Operations on Complex Numbers and DeMoivre's Theorem
Stunning fractals can be created using complex numbers. Source: In the previous post, I showed how complex numbers developed, what they mean, and how they can be…
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drdawud (42)in #mathematics • 7 years ago
The Complex Number System: An Introduction
Our ultimate goal in this series of posts is to find all possible solutions for the nth roots of unity, and in general, for complex numbers. I anticipate this might take two or…
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drdawud (42)in #photography • 7 years ago
Buddhist Calligraphy on a Stone Column: Osaka, Japan
This photo was taken at a Buddhist temple in Osaka, Japan. I don't remember which one. It depicts a stone column with the inscription "南無阿彌陀佛" (Hiragana: なむあみだぶつ, Romaji "namu…
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drdawud (42)in #colorchallenge • 7 years ago
Color Challenge: Purple
Hello Steemians, Here is my attempt at the color challenge. I took these photos on the grounds of the Tianyuan Temple on the outskirts of Taipei. The Tianyuan Temple is known…
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drdawud (42)in #photography • 7 years ago
Some Views of Gyeongbok Palace 경복궁 in Seoul, Korea
A view of Gyeonghoeru (Hangul: 경회루; Hanja: 慶會樓; Literally, "Hall of Celebration"), built in 1867. It is built upon an artificial lake, and features Mt. Bugak as a backdrop.…
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drdawud (42)in #photography • 7 years ago
Taipei 101 On a Cloudy Evening
The Taipei 101 Tower is a landmark the Xinyi District of the City of Taipei. It measures 509.2m tall [ Source ] and was the tallest building in the world before being supassed…
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drdawud (42)in #math • 7 years ago
Two Simple Geometry Questions
On this day in 1809, Joseph Liouville was born. Also on this day in 1721, Johann Sebastian Bach published his famous Brandenburg Concertos which he dedicated to…
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drdawud (42)in #math • 7 years ago
Vieta's Formulas
Francois Viete, for whom the topic of this post is named. Source: Wikipedia.org , Public Domain François Viète was a French mathematician who worked in the 16th century…
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drdawud (42)in #motivation • 7 years ago
Returning to the Fundamentals: On the need for Strength and Prowess
Note: This essay is based on a talk given by Dr. Saiffudin Robinson. It was originally published at the now-defunct RidingTheTiger.org, and has been reprinted with…
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