[Video] Postcards For a Friend

Please use the address in the video.

Postcard ideas

  • A quote
  • An address
  • A manifesto
  • A joke
  • A drawing
  • A short poem
  • A math problem

Sources

Outhouse: daveynin
https://creativecommons.org/licenses/by/2.0/

Happy Beaver: Steve Hersey
Used with permission

Blackboard: Marco Verch Professional Photographer
https://creativecommons.org/licenses/by/2.0/

Nondeterministic Turing machine diagram: João Guilherme Fritsche Colombo, Jerusa Marchi, A nondeterministic Turing machine variant to compute functions, Theoretical Computer Science, Volume 902, 2022, Pages 54-63, ISSN 0304-3975, https://doi.org/10.1016/j.tcs.2021.12.008. (https://www.sciencedirect.com/science/article/pii/S0304397521007179) Abstract: Formally defining how outputs of nondeterministic computations may be combined, we propose a nondeterministic Turing machine variant to compute functions. First, we describe our inspiration, the association of a computation tree with the divide and conquer strategy. Next, we define the variant and prove its equivalence with the deterministic Turing machine model. Then, we give some examples and relate the variant to alternating, counting and metric Turing machines. After, we define the variant’s time complexity classes and compare them to deterministic space, giving a new characterization of the Image 1 and Image 2 classes. Finally, we outline future work. Keywords: Nondeterministic Turing machines; Computable functions; Divide and conquer; Time complexity; Polynomial space; Counting Turing machines

Scuba diving: Dave Wilson
https://www.davewilsonphotography.com/2020/04/22/safety-stop/
https://creativecommons.org/licenses/by-nc/4.0/

Yaks in Tibet: That’s mine, yo!

WTF?: “End of Ze World” by AlbinoBlackSheep

Cactus: Ronny Skroblin
https://creativecommons.org/licenses/by-nc-nd/3.0/
https://skroblin.com/en/photos/category/36-usa2009

We can cure my illness and my poverty if you support my recovery.

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