Existence Proofs

Source: https://xkcd.com/1856/

How To Use Facebook Emoji to Respond to a Mathematical Proof

Source: https://www.facebook.com/MathWithBadDrawings/photos/a.822582787758549/2865881973428610/?type=3&theater

Snakes on a Plane

Sadly, the snakes fail the vertical line test.

Source: https://www.facebook.com/photo.php?fbid=2275159199164147&set=gm.500736803735509&type=3&theater

The Mathematical Equivalent of Sticking a Fork into an Electrical Socket

Source: https://www.facebook.com/MathWithBadDrawings/photos/a.822582787758549/2902370699779737/?type=3&theater

Can I Do Something To Help My Grade?

Significant Digits and Useless Digits

A pet peeve of mine is measuring things to far too many decimal places. For example, notice that the thickness of these trash bags is 0.0009 inches (0.9 mil) but is 22.8 microns in metric. There are two mistakes:

  • While the conversion factor is correct, there’s no way that the thickness is known within only 0.1 microns, or 100 nanometers. That’s significantly that a typical cell nucleus.
  • Less importantly, if they rounded correctly, it should be 22.9 microns, not 22.8.

My favorite example that I’ve personally witnessed — that I wish I had a picture of — is measuring student’s perceptions of a professor’s teaching effectiveness is 13 decimal places.

This webcomic from xkcd illustrates the point both cleverly and perfectly.

Source: https://xkcd.com/2170/

Pythagorean Theorem and Social Distancing

Once upon a time in algebra class…

Side note: Yes, there’s only one true exponential curve on the graph. Yes, the spread of COVID-19 is best modeled with a logistic growth curve or an SEIR model. Nevertheless, this comic absolutely rings true.

Source: https://www.facebook.com/photo.php?fbid=10219301871391874&set=a.1147301637049&type=3&theater

Jordan Lyles Becomes First Brewer To Wear Irrational Number

From the Onion, and posted in honor of the imminent Opening Day of the 2020 Major League Baseball season.

Why Alien Abductions Only Happen At Night

Source: https://www.facebook.com/biachinthekitchen/photos/a.399490790149821/2109676905797859/?type=3&theater