Posts Tagged ‘math’

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what is converse and contrapositive and inverse – Google Search

March 16, 2026

https://www.google.com/search?q=what+is+converse+and+contrapositive+and+inverse&sca_esv=9c862ab14c0bc3f3&sxsrf=ANbL-n7MPap6WyRGVMwHeJQzr9bfjsJAWA%3A1773607979085&ei=Kxy3aefzBOGmptQP47af6QU&biw=1445&bih=958&ved=0ahUKEwintcHM5KKTAxVhk4kEHWPbJ10Q4dUDCBE&uact=5&oq=what+is+converse+and+contrapositive+and+inverse&gs_lp=Egxnd3Mtd2l6LXNlcnAiL3doYXQgaXMgY29udmVyc2UgYW5kIGNvbnRyYXBvc2l0aXZlIGFuZCBpbnZlcnNlMgYQABgWGB4yBhAAGBYYHjIGEAAYFhgeMgYQABgWGB4yBhAAGBYYHjIGEAAYFhgeMgYQABgWGB4yCxAAGIAEGIYDGIoFMgsQABiABBiGAxiKBUi7D1DNAljLDXABeAGQAQCYAdMBoAGzCqoBBTYuNS4xuAEDyAEA-AEBmAINoALXCsICChAAGLADGNYEGEfCAggQABiABBiiBMICCBAAGKIEGIkFmAMAiAYBkAYIkgcFNy41LjGgB9NtsgcFNi41LjG4B9UKwgcGMC4xMi4xyAcagAgA&sclient=gws-wiz-serp

if P then Q : P => Q
converse : Q => P
inverse : ~P => ~Q
contrapositive : ~Q => ~P. (logically true when P => Q is true)

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Microsoft Word – Seven.new.doc

February 15, 2026

https://condor.depaul.edu/ppereira/sym/Notes/Seven.pdf
7 frieze pattern

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math video

January 11, 2026

3Blue1Brown. (2020, August 19). Group theory, abstraction, and the 196,883-dimensional monster [Video]. YouTube.
https://www.youtube.com/watch?v=mH0oCDa74tE

https://www.youtube.com/watch?v=mH0oCDa74tE

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is a rotation 180 degrees about the origin also a reflection – Google Search

December 9, 2025

https://www.google.com/search?q=is+a+rotation+180+degrees+about+the+origin+also+a+reflection&oq=is+a+rotation+180+degrees+about+the+origin+also+a+reflection&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRg8MgYIAhBFGDwyBggDEEUYPNIBBzY2NWowajeoAgCwAgA&sourceid=chrome&ie=UTF-8

Yes, a 180-degree rotation about the origin is equivalent to a point reflection (or inversion) through the origin

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Desmos | Graphing Calculator

February 26, 2024

https://www.desmos.com/calculator

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Euler’s totient function (video) | Khan Academy

January 28, 2024

https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/euler-s-totient-function-phi-function
Also, Euler phi function

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Euler’s Totient Function and Euler’s Theorem

January 28, 2024

https://www.doc.ic.ac.uk/~mrh/330tutor/ch05s02.html

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What is 25 mod 2? (25 modulo 2?)

January 13, 2024

https://divisible.info/Modulo/What-is-25-mod-2.html

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The Caesar cipher (video) | Cryptography | Khan Academy

January 13, 2024

https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/caesar-cipher#:~:text=The%20Caesar%20Cipher%2C%20used%20by,exploits%20patterns%20in%20letter%20frequencies.

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Fermat’s little theorem (video) | Khan Academy

January 13, 2024

https://www.khanacademy.org/computing/computer-science/cryptography/random-algorithms-probability/v/fermat-s-little-theorem-visualization
a^p = a mod p

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