Jeff Erickson

icon indicating a website link http://jeffe.cs.illinois.edu icon indicating an email [email protected]

icon company Siebel School of Computing and Data Science, University of Illinois Urbana-Champaign icon location Urbana, IL icon location ...cannot consistently believe this sentence is true.

Results 4 issues of Jeff Erickson

[Oops.] Subtle omission in Lemma 4.1 and 4.2

1 comment

_Reported by Neal Young via email:_ I'm wondering about a possible error in your book's Chapter 4 on greedy algorithms. Specifically, in Lemmas 4.1 and 4.2 in Section 4.1 [1]....

error

[Oops.] No, you can't do that.

See https://www.reddit.com/r/UIUC/comments/ccjs0v/some_confusion_about_this_prove/

ERROR!
exercises
facepalm

Feature request: pl-order-blocks with multiple correct solutions

18 comment

We are using `pl-order-blocks` for proof questions in CS 374. For the simple results we are asking students to prove, there is more than one correct proof. For example, in...

Clustered cool-down periods

4 comment

Currently PL allows questions to enforce “cool-down” periods between attempts, via `gradeRateMinutes`. It would be nice to have finer control over this delay. The crudest design would be to limit...

student-facing