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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[[Image:PeterSaveliev.jpg|right]] | [[Image:PeterSaveliev.jpg|right]] | ||

− | Hello! My name is Peter Saveliev. I am a professor of mathematics at Marshall University, Huntington WV, USA. | + | Hello! My name is Peter Saveliev (rhymes with “leave”). I am a professor of mathematics at Marshall University, Huntington WV, USA. |

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

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*''[[Calculus Illustrated]]'', volume 1 published in 2019 | *''[[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 }$$ |

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. | 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. | ||

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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: | 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! | *(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! | + | *(b) Two $-1$'s: $180$ degrees rotation, the we have two right (or two left) hands. No! |

− | *(c) Three $-1$s: central symmetry. Yes! | + | *(c) Three $-1$'s: central symmetry. Yes! |

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*[https://twitter.com/PeterSaveliev Twitter](MATH ONLY) | *[https://twitter.com/PeterSaveliev Twitter](MATH ONLY) | ||

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[[category: Mathematics]] | [[category: Mathematics]] |

## Revision as of 14:59, 17 November 2019

Hello! My name is Peter Saveliev (rhymes with “leave”). 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 that makes 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.