This site is devoted to mathematics and its applications. Created and run by Peter Saveliev.

# Difference between revisions of "Peter Saveliev"

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My current projects are these two books: | My current projects are these two books: | ||

− | *''[[Topology Illustrated]]'', published 2016 | + | *''[[Topology Illustrated]]'', published in 2016 |

− | *''[[Calculus Illustrated]]'', | + | *''[[Calculus Illustrated]]'', volume 1 published in 2019 |

In part, the latter book is about ''Discrete Calculus'', which is based on a simple idea: | In part, the latter book is about ''Discrete Calculus'', which is based on a simple idea: | ||

$$\lim_{\Delta x\to 0}\left( \begin{array}{cc}\text{ discrete }\\ \text{ calculus }\end{array} \right)= \text{ calculus }.$$ | $$\lim_{\Delta x\to 0}\left( \begin{array}{cc}\text{ discrete }\\ \text{ calculus }\end{array} \right)= \text{ calculus }.$$ | ||

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− | * | + | *-Why is discrete calculus better than infinitesimal calculus? -Why? -Because it can be integer-valued! -And? -And the integer-valued calculus can detect if the space is non-orientable! Read [[Integer-valued calculus]], an essay making a case for discrete calculus by appealing to topology and physics. |

[[image:mirror image of man.png| center]] | [[image:mirror image of man.png| center]] | ||

− | *[[The political spectrum is a circle]], an essay based on the very last section of the topology book. | + | *-The political “spectrum” might be a circle!- So? -Then there can be no fair decision-making system! Read [[The political spectrum is a circle]], an essay based on the very last section of the topology book. |

[[image:Political_spectrum_as_circle_distorted_D.png| center]] | [[image:Political_spectrum_as_circle_distorted_D.png| center]] |

## Revision as of 03:06, 11 September 2019

Hello! My name is Peter Saveliev. I am a professor of mathematics at Marshall University, Huntington WV, USA.

My current projects are these two books:

*Topology Illustrated*, published in 2016*Calculus Illustrated*, volume 1 published in 2019

In part, the latter book is about *Discrete Calculus*, which is based on a simple idea:
$$\lim_{\Delta x\to 0}\left( \begin{array}{cc}\text{ discrete }\\ \text{ calculus }\end{array} \right)= \text{ calculus }.$$
I have been involved in research in algebraic topology and several other fields but nowadays I think this is a pointless activity. My non-academic projects have been: digital image analysis, automated fingerprint identification, and image matching for missile navigation/guidance.

- Once upon a time, I took a better look at the poster of
*Drawing Hands*by Escher hanging in my office and realized that what is shown isn't symmetric! To fix the problem I made my own picture called*Painting Hands*:

Such a symmetry is supposed to be an involution of the $3$-space, $A^2=I$; therefore, its diagonalized matrix has only $\pm 1$ on the diagonal. These are the three cases:

- (a) One $-1$: mirror symmetry, then pen draws pen. No!
- (b) Two $-1$s: $180$ degrees rotation, the we have two right (or two left) hands. No!
- (c) Three $-1$s: central symmetry. Yes!

- -Why is discrete calculus better than infinitesimal calculus? -Why? -Because it can be integer-valued! -And? -And the integer-valued calculus can detect if the space is non-orientable! Read Integer-valued calculus, an essay making a case for discrete calculus by appealing to topology and physics.

- -The political “spectrum” might be a circle!- So? -Then there can be no fair decision-making system! Read The political spectrum is a circle, an essay based on the very last section of the topology book.

Note: I am frequently asked, what should "Saveliev" sound like? I used to care about that but got over that years ago. The one I endorse is the most popular: "Sav-leeeeeev". Or, simply call me *Peter*.