Roger Joseph Witte

Software Engineer, Transport Moddeller, step-grandfather

[Roger Joseph Witte @roger_witte]

@CburgesCliff R

[Roger Joseph Witte @roger_witte]

@mouse_math This mirrors the historical development; abstract algebra is surprisingly modern!

[Roger Joseph Witte @roger_witte]

@JDHamkins @ThosVarley The counter example was a new proof of a theorem by Charles Resc that HOTT researchers found.

[Roger Joseph Witte @roger_witte]

@JDHamkins @ThosVarley I think that having a Lean or Coq formalization proves just shunts the checking from checking the logic into checking that the formal statements really do express the intended ideas. Joel's second point is only majoritatively true (but I can only think of one counter-example)

[Roger Joseph Witte @roger_witte]

@mouse_math @lady_valor_07 Safety pins and elastic bands also

[Roger Joseph Witte @roger_witte]

@JoanneMOrmesher You look very pretty but slightly bored in this picture.

[Roger Joseph Witte @roger_witte]

@miniapeur Is this the difference homomorphism and isomorphism.

[Roger Joseph Witte @roger_witte]

@JoanneMOrmesher You are dressed up very feminine and girly in that photo, but I bet you prefer your sooty overalls when you are bashing orms.

[Roger Joseph Witte @roger_witte]

@emilyriehl Minor dad joke - talking about k and suck!

[Roger Joseph Witte @roger_witte]

@mouse_math One of the disadvantages of car-centric (zoned) planning is that it makes it more difficult to give up driving. You are almost under house arrest. When my Dad, in London England, decided he was no longer safe at the wheel, he was still able to walk to the local shops.

[Roger Joseph Witte @roger_witte]

@mouse_math Is the lower one the fano plane? There's a lecture on you tube at the Royal Institution by Jordan Ellenberg on beating a lottery with a fano plane.

[Roger Joseph Witte @roger_witte]

@TaliaRinger Wishing you both speedy recovery! And let's hope that, for once, your husband doesn't get to share in the family experience.

[Roger Joseph Witte @roger_witte]

@JoanneMOrmesher Is this proof that you can look great and feel s**t at the same time?

[Roger Joseph Witte @roger_witte]

@wylfcen It's almost extinct - you can still find enclaves in Essex - but MLE is probably the main London dialects.

[Roger Joseph Witte @roger_witte]

@littmath Having carefully watched the ludicrous conclusions of efforts to mathematically analyse love by both Eugenia Cheng and Hannah Fry (seperately), I would urge caution.

[Roger Joseph Witte @roger_witte]

@mouse_math That only gets you a RNG (no multiplicative identity).

[Roger Joseph Witte @roger_witte]

@Jose_A_Alonso Short and obvious - as all the best mathematical writing appears once read and understood (of course, it's a clif prior to that)

[Roger Joseph Witte @roger_witte]

@Ganeshuor My favourite pi approximation is square root 10. It's especially convenient when you need pi squared

[Roger Joseph Witte @roger_witte]

@littmath @BlakeDemarest12 @jasondeanlee I like Andre Baur's idea that with formal proofs the computer verifies the string of symbols. But the human has to verify that the string symbols means what is intended.

[Roger Joseph Witte @roger_witte]

@littmath @AcerFur Depending on how similar the two proofs are, it still might be important and influential. We should remember that maths is about the proofs as well as the things being proven.