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A BBC Podcast on 'e'

Melvyn Bragg and his guests discuss Euler's number, also known as e. First discovered in the seventeenth century by the Swiss mathematician Jacob Bernoulli when he was studying compound interest, e is now recognised as one of the most important and interesting numbers in mathematics. Roughly equal to 2.718, e is useful in studying many everyday situations, from personal savings to epidemics. It also features in Euler's Identity, sometimes described as the most beautiful equation ever written.

With:

Colva Roney-Dougal

Reader in Pure Mathematics at the University of St Andrews

June Barrow-Green

Senior Lecturer in the History of Maths at the Open University

Vicky Neale

Whitehead Lecturer at the Mathematical Institute and Balliol College at the University of Oxford

Producer: Thomas Morris.

Euler's constant, mysterious 'e',

A number so simple, yet complex to see.

Its value transcends all numbers whole,

A mathematical gem, a limitless goal.

Defined by a series, it seems to go on,

Without end or pattern, forever drawn.

Yet it's woven into life's very fabric,

From the growth of populations to a rabbit's antics.

Compounding interest, exponential growth,

The power of 'e' is clearly shown.

A constant that defies all limits,

Infinite and unbounded, it never quits.

It's found in nature, in physics and space,

From the motion of particles to the speed of light's pace.

An underlying force, it drives us ahead,

A symbol of progress, of the future we tread.

So let us embrace this magical 'e',

A symbol of possibility, of all that can be.

A reminder that limits are just in our mind,

And that with perseverance, we can break through the bind.

- chatGPT

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905198704230017946553679...

905198704230017946553679...

Sarah was a young mathematician studying at a liberal arts college. She majored in Mathematics and minored in English Literature, and had a special love for poetry. She often spoke of mathematics as the most poetic of disciplines. "I love its beauty," she said.

Sarah also took process theology under me. She liked the idea that in process theology mathematical entities reside in the very mind of God, which means that mathematical inquiry can be a way of exploring and experiencing the divine mind. Like Whitehead, she was Platonic in sensibilities. She didn't think we humans create mathematical entities, she thought we discover them, and that in some ways they were already "there" to be discovered. And she was among the few of my students who wanted to read Whitehead's mathematical works. (For some overviews, click here.)

Sarah was also attracted to the idea that mathematical entities, numbers for example, could be metaphors for God. She told me about friends of hers who have their doubts about God but not about numbers: "They believe in the beauty of equations. I think that's their way of believing in God."

One day she came into my office wanting to discuss God and the number 'e.' She found it amazingly beautiful in its own right, with its endless series of decimals and its transcendental status. I was unfamiliar with 'e,' and she tried to explain it to me. Scroll down for my own explanation, or, better, listen to the BBC podcast above in which some mathematicians discuss 'e' and its applications. Sarah suggested that just as 'e' is essential to many mathematical equations, so God is essential to the fabric of the universe. And just as 'e' is beautiful in its complexity and elegance, so too is God beautiful in the way God helps give the world its patterns. For her, mathematics was not at all about numbers alone; it was about pattern recognition. "Numbers," she said, "are the ways patterns are arranged."

She saw similar forms of arrangement in poetry, not only in the contents of words in relation to one another, but in their placement on pages and screens. "The white space is as important as the words." She gave me new eyes for Buddhist notions of Emptiness. I hoped that some day she might come back and we could talk about God and 0. And maybe God and 3.

I saw that, for her, mathematical metaphors for God could be as helpful, and sometimes more helpful, than personal metaphors. I began to think of God in e-like terms. God is E with an upper case E, and 'e' is e with a lower case e.

I see seven affinities between E and e. Each is transcendental, irrational, constant, functional, endless, non-repetitive, and amazing. The descriptors will differ in meaning relative to theology and mathematics, but the similarities are still present.

To say that E is**irrational** means that E cannot be represented as a simple fraction such as 1/2 or 11/5. God cannot be fractionalized.

To say that E is**constant** means that E's love is unchanging. E is present throughout the universe in a way that is homologous, the same throughout. In the words of Thomas Oord, God is essentially kenotic.

To say that E is**non-repetitive** means the applications of divine love in the world through 'lures' are changing from circumstance to circumstance, never quite repeating itself, because the circumstances are different. God is temporal as well as timeless.

To say that E is**endless** is to say that God is never finished, there is always more to E than is contained in its past, just as the number 'e' has no final decimal.

To say that E is**transcendental** means that E is not merely a "solution" to certain intellectual problems but rather, and more deeply, a beautiful presence, like 'e' itself.

To say that E is**functional **is to say that E is perpetually at work in the universe as an organ of order and novelty, connecting things.

To say that E is**beautiful** is to say that the power of this E is not force or compulsion, not violence or manipulation, but beauty. It is everywhere, in a non-coercive way, connecting things.

I well realize that none of this proves the existence of God. And for some the very word "God" has a sacredness to it that cannot be substituted by the letter E, even if capitalized. But for others, the word "God" carries overly heavy baggage, and E is better. For them there is something freeing and refreshing about E that cannot be conveyed by the word "God." Whereas some might say E is another word for God, they would reverse it: God is another word for E.

The universe is laced with the transcendental, irrational, constant, endless, non-repetitive, functional, and beautiful. I can well imagine a mathematical liturgy which begins with a shared conviction: Praise E from whom many blessings flow, some of which are in science, mathematics, and engineering, and some of which are in wonder. The scripture would be Euler's equation. The congregants would include mathematicians from different parts of the world. Sarah would be there, and maybe even Whitehead.

- Jay McDaniel

Sarah also took process theology under me. She liked the idea that in process theology mathematical entities reside in the very mind of God, which means that mathematical inquiry can be a way of exploring and experiencing the divine mind. Like Whitehead, she was Platonic in sensibilities. She didn't think we humans create mathematical entities, she thought we discover them, and that in some ways they were already "there" to be discovered. And she was among the few of my students who wanted to read Whitehead's mathematical works. (For some overviews, click here.)

Sarah was also attracted to the idea that mathematical entities, numbers for example, could be metaphors for God. She told me about friends of hers who have their doubts about God but not about numbers: "They believe in the beauty of equations. I think that's their way of believing in God."

One day she came into my office wanting to discuss God and the number 'e.' She found it amazingly beautiful in its own right, with its endless series of decimals and its transcendental status. I was unfamiliar with 'e,' and she tried to explain it to me. Scroll down for my own explanation, or, better, listen to the BBC podcast above in which some mathematicians discuss 'e' and its applications. Sarah suggested that just as 'e' is essential to many mathematical equations, so God is essential to the fabric of the universe. And just as 'e' is beautiful in its complexity and elegance, so too is God beautiful in the way God helps give the world its patterns. For her, mathematics was not at all about numbers alone; it was about pattern recognition. "Numbers," she said, "are the ways patterns are arranged."

She saw similar forms of arrangement in poetry, not only in the contents of words in relation to one another, but in their placement on pages and screens. "The white space is as important as the words." She gave me new eyes for Buddhist notions of Emptiness. I hoped that some day she might come back and we could talk about God and 0. And maybe God and 3.

I saw that, for her, mathematical metaphors for God could be as helpful, and sometimes more helpful, than personal metaphors. I began to think of God in e-like terms. God is E with an upper case E, and 'e' is e with a lower case e.

I see seven affinities between E and e. Each is transcendental, irrational, constant, functional, endless, non-repetitive, and amazing. The descriptors will differ in meaning relative to theology and mathematics, but the similarities are still present.

To say that E is

To say that E is

To say that E is

To say that E is

To say that E is

To say that E is

To say that E is

I well realize that none of this proves the existence of God. And for some the very word "God" has a sacredness to it that cannot be substituted by the letter E, even if capitalized. But for others, the word "God" carries overly heavy baggage, and E is better. For them there is something freeing and refreshing about E that cannot be conveyed by the word "God." Whereas some might say E is another word for God, they would reverse it: God is another word for E.

The universe is laced with the transcendental, irrational, constant, endless, non-repetitive, functional, and beautiful. I can well imagine a mathematical liturgy which begins with a shared conviction: Praise E from whom many blessings flow, some of which are in science, mathematics, and engineering, and some of which are in wonder. The scripture would be Euler's equation. The congregants would include mathematicians from different parts of the world. Sarah would be there, and maybe even Whitehead.

- Jay McDaniel

- Mudassir Ibrahim: http://mudassiribrahim.blogspot.com/2015/04/euler-rotation-and-eulers-formula.html

For Us Non-Mathematicians

"e" is a special number that appears in many areas of mathematics, science, and engineering. It is a mathematical constant in that, if used in an equation, it does not change. It is not a variable. It is one of the five most important mathematical constants, along with 0, 1, π (pi), and i (the imaginary unit).

Another property is that its decimal expression is non-repetitive. It is approximately equal to 2.71828 if we need to simplify, but its decimal expression goes on infinitely without repeating the same pattern.

Another important property of "e" is that it is an

An additional important property of "e" is that it is

This means that "e" cannot be expressed as a solution to any equation that only involves these basic mathematical operations using whole numbers or fractions. For example, the number 2 is not transcendental because it is a solution to the equation x - 2 = 0, which only involves addition and subtraction. The square root of 2 is also not transcendental because it is a solution to the equation x^2 - 2 = 0, which involves only addition, subtraction, multiplication, and exponentiation using whole numbers or fractions. However, "e" is transcendental because it cannot be expressed as a solution to any equation that only involves these basic mathematical operations using whole numbers or fractions.

Amid all this, "e" is immensely functional. One of the most significant applications of "e" is in the field of calculus. It arises naturally in the study of exponential functions and is used extensively in many areas of mathematics and science. For example, "e" appears in the formula for compound interest, which is used in finance and economics.

- chatGPT and Jay McDaniel combined

William Dunham, *Euler: The Master of Us All* (The Mathematical Association of America, 1999)

Tim Gowers, June Barrow-Green and Imre Leader (eds.),*The Princeton Companion to Mathematics* (Princeton University Press, 2008)

Jan Gullberg and Peter Hilton,*Mathematics: From the Birth of Numbers* (W W Norton & Co Ltd, 1997)

Julian Havil,*John Napier: Life, Logarithms and Legacy* (Princeton University Press, 2014)

Georges Ifrah,*The Universal History of Numbers: From Prehistory to the Invention of the Computer* (John Wiley & Sons, 2000)

Eli Maor,*e: The Story of a Number* (Princeton University Press, 2009)

Tim Gowers, June Barrow-Green and Imre Leader (eds.),

Jan Gullberg and Peter Hilton,

Julian Havil,

Georges Ifrah,

Eli Maor,

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