Twenty-something: A time in one’s life when it’s passingly acceptable that most of one’s dishware be of the plastic souvenir sort.

“Look ma! They stack AND I get cheaper refills.”

Thirty-something: A time when one has decommissioned all of one’s souvenir cups only to replace them with twice the amount of mismatched children’s sippy cups and plastic-ware.

“Where’s the lid to this?”

Fourty-something: A time to help a new budding teenager begin their own addiction to plastic souvenir cups.

“This dinosaur cup has such an awesome swirly straw and it glows in the dark!”

📖 Read pages i-20 the front matter and Introduction of Abstract and Concrete Categories: The Joy of Cats by Jirí Adámek, Horst Herrlich, George E. Strecker

📖 Read pages i-20 the front matter and Introduction of Abstract and Concrete Categories: The Joy of Cats by Jirí Adámek, Horst Herrlich, George E. Strecker

Some initial discussion of sets, classes, and conglomerates to keep us out of trouble with some of the potential foundational issues that can be found in set theory.

Highlights, Quotes, Annotations, & Marginalia

completions of partially orderedsets and of metric spaces,ˇCech-Stone compactifications of topological spaces, sym-metrizations of relations, abelianizations of groups, Bohr compactifications of topo-logical groups, minimalizations of reachable acceptors, etc.  

The tough part of category theory is lists of things like this right up front which will tend to scare off almost any reader but those who are working on Ph.D.s in mathematics…
November 30, 2018 at 09:29PM

Motivation  

I really wish more math textbooks had motivation sections like this one does.
November 30, 2018 at 09:35PM

Therefore we advise the beginner to skip from here, go directly to§3, and return to this section only when the need arises.  

They’ve buried the lede here apparently.
November 30, 2018 at 10:15PM

Kuratowski definition of an ordered pair  

I don’t think I’ve ever seen the specific name Kuratowski attached to this.
November 30, 2018 at 10:31PM

📗 Abstract and Concrete Categories: The Joy of Cats by Jirí Adámek, Horst Herrlich, George E. Strecker

📗 Started reading Abstract and Concrete Categories: The Joy of Cats by Jirí Adámek, Horst Herrlich, George E. Strecker

📖 6% done with Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

📖 Read pages xiv-xx of the Preface of Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

Book cover of Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

📖 3% done with Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

📖 Read pages i-xiv of the Preface of Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

Book cover of Twitter and Tear Gas: The Power and Fragility of Networked Protest by Zeynep Tufekci

As I listen to Scene on Radio’s series Men, I’m a bit jarred when they use the word “virtue” without acknowledging its provenance in relation to their topic.

Virtue’s etymology includes the Latin word vir meaning man, which is also the stem of the Latin word virtus meaning valour, merit, moral perfection, and even strength or manliness. These are also, not coincidentally, the antecedent words for the modern English word virile, which has a more in-your-face relationship with men.

I’m thinking we need a more modern “femina”-centered word meaning moral perfection…

It’s only been in the last couple of weeks that I’ve paid more attention to the lyrics in Jim Croce’s song You Don’t Mess Around with Jim to notice that within the story unfolding in the song that the refrain changes in the end and changes the phrase “You don’t mess around with Jim” to “You don’t mess around with Slim“. It’s subtle, but underlines the inherent gruesomeness of the song.

Now I’ll have to go back and revisit his later song Bad, Bad Leroy Brown.