Recent Articles

Odd and even numbers

Apr 14, 2022  

This is a post by my kid, His first post! The rest of the text below is his attempt at explaining odd and even numbers.

Read More ...


My kid’s math teacher recently posted a puzzle for the parents that got me down a rabbit hole of sorts and made me reflect on a number of things. This post is about that … and I mix the math and programming bits. I describe the puzzle in the first section and then the rest reveal aspects of the solution. So if you want to avoid the spoilers, you should stop reading after the first section. Read More ...

Dual Vector Spaces

Jan 18, 2022   #Vector spaces  #Quantum mechanics 
When talking about vector spaces, the notion of a dual vector space seems to often be introduced via postulates, such as in the excellent theoretical minimum series by eminent physicist Dr. Leonard Susskind. While that’s fine, I like an approach using linear functions, which I’ll present here. I learnt this from somewhere obviously, though I don’t recall where from. First a brief recap of vectors using Dirac’s notation. If \(\ket{a}\) and \(\ket{b}\) are vectors, then under a chosen operation “\(+\)”, \(\ket{a} + \ket{b} = \ket{c}\) is also a vector. Read More ...

Fairness in TLA+

Dec 9, 2020   #TLA  #Weak Fairness  #Strong Fairness 

As a TLA+ newbie, I found the fairness (weak and strong) formulae in TLA+ a bit hard going initially, so sharing the way I managed to wrap my head around it in case it is of help to others. What I’m hoping to get to is to be able to “read” the formulae in a chunked manner so that they make logical sense to me.

Read More ...

Inai: REST in the Small

Nov 23, 2020   #REST  #Javascript 
(originally posted on the Imaginea Labs blog - DRAFT The Inai project (forked here) began as a light hearted attempt to explore the consequences of bringing REST principles to organizing components within a single server node. It started off with the following question - Given we know that REST principles are useful to organize the development, deployment and evolution of large collections of services, would those principles be useful in the small - i. Read More ...

The Calculus You Actually Need for Deep Learning

Oct 2, 2020   #Calculus 
DRAFT: Need to proof read expressions and derivations. The Matrix Calculus You Need For Deep Learning (MCYNDL) is a great summary of what you need and expands starting from pretty much the basics. However, I’ve always felt that introducing the index notation used in physics can help simplify what looks like complicated math, even in that simplified intro. So here is my attempt at re-presenting the material in that paper, but using the simplified index notation. Read More ...

Speculative: SciML for Physical Modeling Synthesis

Aug 10, 2020   #SciML  #JuliaLang  #Zygote  #Physical modeling synthesis 
Tools in the “Scientific Machine Learning” (SciML) space have been getting more sophisticated and general purpose. While going through some material regarding “universal differential equations”, I couldn’t help dream up potential applications to tough problems in physical modeling synthesis of musical instruments .. particuarly interested in the vina family of instruments. Noting down some speculative thoughts here that I hope will refine and be replaced with more accurate ones as I learn more. Read More ...

The await-on-need Pattern

Mar 26, 2020   #async/await  #Promise 
(DRAFT) The async/await facility in ES5 is perhaps the single biggest readability boost to async code in Javascript - both in NodeJS and in client-side JS code. With async/await, code that does async activities starts to read like synchronous code with the keywords async and await thrown in at appropriate points. But don’t lose sight of opportunities for concurrency while settling into the comfort zone of synchronous-looking code. One way to think of and use async/await usage in JS is like this - Read More ...

I'm LisP. I'm inevitable.

Feb 19, 2020   #LisP  #muvee  #Video editing 
This is a stub post linking to material presented during my talk titled “I’m LisP. I’m inevitable.” at the first Chennai Clojure meetup at Pramati Technologies. Downloads View slides online PDF slides PowerPoint slides Video of talk

Talk: the Nuts and Bolts of Webassembly

Aug 24, 2019   #WebAssembly  #Capability based security  #Clang  #LLVM 

I gave a talk at the “Mixed Nuts @ Pramati” meetup on 2019-08-24 10am-12pm on WebAssembly. This post contains notes from the talk - sort of almost-transcript.

Simul-posted at

Read More ...