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

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,