A Star.

I introduced the A* notation with the thought that our algorithm (A*) was better than any other algorithm, better than anyone else's algorithm A, and we're gonna prove it!

Peter Hart, as cited in A* Search: What's in a Name? by James W. Davis, Jeff Hachtel (https://doi.org/10.1145/3326600)

Testing Spam.

Dear friend,

As is well known, the reagents for virus detection are facing serious shortage situation in many countries and it will take at least $1400 USD/ per person for the coronavirus detection. As result, there are a large number of people who have already show some symptom cannot be detected. Not to mention those asymptomatic infections, they might be the close contacts who remaining undetectable and are potential risks to person around them. To avoid this bad situation, I would like to recommend a test kit for COVID for you. Compared with $1400 USD test cost per person, the test kit we have is only $298 USD per box, and each box contains 25 pcs of test cassette which can be applied to 25 person.

You can tell the result within 15 minutes using this test kit by identifying where the result shows, as indicates negative, positive and uncertain position. The accuracy of the result is more than 95% and it is made by the National Military Research Institute. Most importantly, this test kits is the one that recently donated to Iran by China government.

Should this test kit be of your interest, please let me know. My Email is: [REMOVED]

a recent spam email

Disturbing Spam.

Hello there! I'm sorry to disturb you. I am a Chinese mask factory. There are a large number of disposable stocks. The masks have CE certification for the EU. In addition, the factory also has FDA and ISO certification. Welcome to contact us!

a recent spam email (bold emphasis added)

Virause.

Unangekündigte (Schreib)pause bis 2020-04-14.

Gitegory Theory.

We begin by defining a category of files and patches, where the operation of merging the effect of two coinitial patches is defined by pushout. Since two patches can be incompatible, such a pushout does not necessarily exist in the category, which raises the question of which is the correct category to represent and manipulate files in conflicting state. We provide an answer by investigating the free completion of the category of files under finite colimits, and give an explicit description of this category: its objects are finite sets labeled by lines equipped with a transitive relation and morphisms are partial functions respecting labeling and relations.

Samuel Mimram, Cinzia Di Giusto: A Categorical Theory of Patches (https://doi.org/10.1016/j.entcs.2013.09.018)