A difficult problem Published on October 1, 2024October 1, 2024 by fivecolorssandt@icloud.com Too hard The challenge problem was difficult. The interesting question is: why? Read More
Common sense Published on November 7, 2023November 6, 2023 by fivecolorssandt@icloud.com Everyone has it We consider common sense as a philosophical principle. Read More
Unnatural mathematics Published on December 21, 2021December 19, 2021 by fivecolorssandt@icloud.com Horizontal and vertical Learning math involves unlearning many obvious things. Read More
Attempting the impossible (II) Published on November 9, 2021November 5, 2021 by fivecolorssandt@icloud.com Parallel lines We continue to wonder what good can come of trying to do what can’t be done. Read More
Prove it! Published on June 11, 2019June 9, 2019 by fivecolorssandt@icloud.com Geometry is unnatural Why learning (and teaching) the subject is hard. Read More
Don’t know much geometry (II) Published on April 9, 2019April 8, 2019 by fivecolorssandt@icloud.com Stuff I learned in school More reasons for apparently useless subjects. Read More
Making a drawing (I) Published on March 26, 2019March 26, 2019 by fivecolorssandt@icloud.com The importance of the rough sketch Sometimes, the rougher the better. Read More
Providing proof Published on October 23, 2018October 23, 2018 by fivecolorssandt@icloud.com If-then-therefore Doing proofs in Geometry class is hard. Teaching how to do them is harder. Read More