## January 6, 2011

### Linked-list, stage 1

A slight twist. Three questions, back-to-back, all related. All you need to do is tell us what the variables A through K stand for.

Anyone who gets the whole set gets a bonus point. All questions remain open for 3 more days!

This post has 3 variables (**A, B, C**). Get all 3 right to get 1 point :-)

Eastern-european logician **A** invented **B** around 1920 in order to simplify sentences used in propositional calculus. **B** remained in use largely in logic and didn’t see much interest in mainstream arithmetic. Despite this, a “reversed” version of B became popular with some electronic devices, notably those from company **C**! The devices from **C**, especially, have become iconic and gained a cult following. (Though many people consider them to be merely a curiosity, **C**’s devices have some very advanced arithmetic in them and a Turing Award winning UCBerkeley maths/CS prof was involved in their design!).

Cracked by **Goyal ** , Rogi(2) , dineshk(2) , Kaustubh(2) , buk , Anjul , apar , jowens(2) , p vs np(2) , puneet_k(2) , Sumanth Patlolla(2) , shrik(2) , Dibyo(2) , vinayaknp(2) , Siddarth Pai , Bharath(2) , Aravind , Pawankumar Hegde(2) , madhur(2) , Qbrain(2) and lanu(2)

And these people got the **bonus point! **

Rogi, dineshk, Kaustubh, jowens, p vs np, puneet_k, Sumanth Patlolla, shrik, Dibyo, vinayaknp, Bharath, Pawankumar Hegde, madhur, Qbrain, lanu,

Answer:

A-Jan Łukasiewicz

B-Polish Notation

C-Hewlett-Packard

Jan Łukasiewicz, Polish Notation, HP

A-Jan Łukasiewicz

B-Polish Notation

C-Hewlett-Packard

A = Jan Lukasiewicz

B = Polish notation aka Prefix notation

C = Hewlett Packard.

The HP scientific calculators used polish notation and William Kahan, the Berkeley CS prof. helped in the design of the HP-10C series.

A – Jan Lukasiwicz

B – Polish Notation

C – HP

A – Jan Lukasiewicz

B – Polish Notation

C – HP (Hewlett-Packard)

A is Jan Łukasiewicz the Polish logician

B is ‘Polish Notation’ (RPN or Reverse Polish Notation is more commonly known)

C is Hewlett Packard whose calculators used RPN

A = Jan Łukasiewicz

B = Polish Notation

C = HP

A – Jan Łukasiewicz

B – Polish notation

C – Hewlett Packard

D – Hungarian notation

E – Charles Simonyi

F – Microsoft

G – iPad (wrt Tablet PC)

H – Robert Metcalfe

I – Xerox Parc

J – Apple

K – Macintosh (though I would argue the Apple II would be a more appropriate “first commercial success”)

Awesome set of questions! Here goes –

A : Jan Łukasiewicz

B : Polish notation

C : Hewlett Packard

A -> Jan Lukasiewicz / Jan Łukasiewicz (Poland)

B -> Polish notation

C -> Hewlett-Packard

A- Jan Łukasiewicz

B- Polish notation or Prefix notation

C- HP-10C series calculators

A – Jan Lukasiewicz

B – Polish notation

C – HP

A: Jan Łukasiewicz

B: Polish Notation

C: Apple

A: Jan Lukasiewicz

B: Postfix, or Polish Notation

c: Hewlett Packard

A: Jan Lukasiewicz

B: Polish Notation

C: Hewlett Packard

A- Jan Lukasiewicz

B- Polish Notation

C- Hewlet Packard, in their science calculators.

A-Jan Łukasiewicz

B- Polish/ Prefix notation

C- Hewlett Packard

Jan Lukasiewicz invented the Polish notation. The reverse polish notation was used extensively in calculators produced by Hewlett-Packard. These calculators were designed with help from the UC Berkeley prof William Kahan

A- Jan Lukasiewicz

B- Polish Notation

C- Hewlett packard

A: Jan Łukasiewicz

B: Polish Notation

C: HP

A – Jan Łukasiewicz polish born logician , invented

B – “Polish Notation” for the logical connectives

Reverse version of B – “Reverser Polish Notation” has been used by

C – Hewlett-Packard – On their calculators.[ i.e., HP-10C calculators]

The UC – Berkely scientist who contributed substantially to the design of the algorithms in the HP-10C series – William Morton Kahan, winner of Turing Award in 1989

A- Jan ukasiewicz

B – Polish notation

C- HP