And Vijay Says…

A lot of people know me primarily through social media – this blog ( and SAP blogs in past) , LinkedIn , Facebook and Twitter . This has generally been a net positive experience for me .

I have been stopped for conversations at airports around the world by random folks. I have walked into meetings with clients where they knew my point of view from my social media posts and hence felt like they knew me already . I was quite active in training and showing dogs till few years ago – I keep in touch with them on Facebook . I have hired quality talent , and made great friends over LinkedIn and Twitter . Just last week a guy who went to college with me and stayed at the same hostel in India – he was in Phoenix for a conference and looked me up on LinkedIn . We had lunch at my house and caught up after a few decades . The list goes on and on – and it more than makes up for the handful of terrible experiences I have had on social media .

I routinely get asked a bunch of questions about my views on social media and how I use it – mostly by people who want to learn , but occasionally also to just imply that they don’t think very highly of it

So I thought why not just address the common questions here .

1. You seem to have a lot of time to be active on social media . Don’t you have a real job ? I can barely keep up with my day job

Contrary to popular belief , I do have a real job and that needs my full attention 🙂 . However , over time I have figured out how to integrate social media into my daily routine . I generally use social media only on my phone – including for long form blogging. That saves a lot of time .

A lot of what I write about is of course regarding my day job . The conversations I have with my clients and colleagues and people I meet on my travels are usually the triggers for my posts .

We always find time for what we like and prioritize . I like to eat Indian food and don’t mind driving 10 miles extra to find an Indian restaurant . Another person might like working out daily and will spend that time running or finding a gym. “I don’t have time” translates usually to “it’s not important for me”.

2. Aren’t you worried about what you say openly in public domain ? Does your manager yell at you for writing something ?

I only talk about my personal views – and usually only about things where I have a strong point of view. So I don’t feel any worry . If I suspect people will mistake it as my employer’s opinion – I state upfront that it is just my views . It has worked well for me so far . I also have no problem standing corrected in public when proven wrong .

Thankfully none of my managers have ever yelled at me for blogging (they do so occasionally for others things) – and have only encouraged me to do so . And I have been their mentor a few times to ease them into social media.

3. Do you have a time table for social media ?

No I don’t blog or tweet at set times . I say something whenever I feel inspired to do that . I don’t check what times I should post to make biggest impact . I don’t aim to get a certain minimum number of page views. I do check statistics on my blog when WordPress alerts me and it’s usually something like “20% of what I write get 80% of views” . Time tables and fine tuned analytics work for many bloggers I know personally – I just haven’t taken that route yet .

4. How do we get started on blogging , twitter etc ?

I can only say how I progressed . My primary use then and now is as a source of curated information . I read at least 10x what I write . Then I started commenting on blogs that I started following . It took me a couple of years to have the confidence to write a blog myself – that was on SAP SCN site . A few years later I figured I have things to say that have nothing to do with SAP – so I started this blog on WordPress .

Twitter use has evolved over time . I use it less and less these days to say something . But it’s still one of the best places to get information . I only follow 150 people there and I think close to 9000 people follow me . Some folks think it’s rude to not follow back . I ignore that policy – I can’t stay on top of a feed any bigger than what I have now . I keep changing the list every now and then .

5. Do you only talk about work ?

Hell no ! I write about anything around me – politics , religion , economics , cricket, dogs … whatever inspires me is a fair topic . Some folks aim for depth on any one topic like Technology . That’s not my approach – all topics that interest me are fair game .

I try to not deviate from work related stuff on LinkedIn . But the truth is all popular social media platforms now have content overlap . You can use the controls they provide to tune your experience to some degree but it’s hard to completely set hard boundaries . I do have a handful of work friends on Facebook for example – and it has not stopped me from expressing what I have to say .

6. Do you take a break from social media ?

Yes I do ! Throughout the year , I take a few months off each channel I use . At the moment, I am out of Facebook . I delete the app on my phone to prevent the temptation to take “a quick look”. These breaks are one reason I continue using these platforms over the years . It also gives me time to read more books !

And there are a few months every year when I just can’t find any inspiration to blog . I have considered just giving it up altogether . But then magically one day I feel like it again and I open the app. The opposite also happens occasionally – I will post multiple blogs back to back .

7. What does success look like ?

For me , engagement is the big prize . When people comment and share and email me about something I wrote – I feel I did something worthwhile . Page views are a feel good metric too – and over the years a lot of page views happen for reasons I can’t always explain rationally . Some of the blogs that I thought I wrote terribly have had the most views – and sometimes even the most comments .

I push all my blogs to LinkedIn and twitter . And if I see someone tweeting or sharing , I will retweet or like. That’s the extent to which I promote . I don’t do any active SEO etc . As the networks have increased over time for me in various channels , I do get more people reading and commenting .

8. How long should a blog be ?

I am a minimalist by nature and quite lazy . So I try to use the minimum words to state my point of view. English is not my first language – so I don’t always succeed . Since I read most blogs on my phone, I tend to favor shorter blogs . There are amazing bloggers who do 5000+ words on average – I don’t have it in me to do that . 1000 to 2000 words is the most I can do.

9. Does someone review what you write ?

Not at all . I am kind of ashamed to admit this – but I also don’t do any proof reading or spell checks . When I finish typing, I hit publish . My wife usually spots errors when she sees it on her feed and routinely criticizes me on not being more careful . Generally this has worked for me so far so I don’t think I am going to change it . On the flip side – this is my biggest fear about writing a book . The process of professional editing scares the crap out of me 🙂

Strangely – I am fanatic about proof reading every document I create at work .

10. Who is your target audience ?

This may not come across very well – but the truth is – I write for myself . I like to believe someone other than me and my mother will find what I write to be useful – but as I mentioned before , only a relatively small proportion of what I write evoke any reaction from my readers . I am cool with that . When I do get feedback , I incorporate it as much as I can the next time I write .

11. Has blogging helped your career ?

Oh yes , without a doubt . While it’s hard to make a specific attribution – blogging and tweeting has generally been quite helpful in making me stand out at work. And as I said before – knowing my POV through my writing has generally been a help in my interactions with clients and business partners . To the best of my recollection – I have never been promoted or given a raise because of what I do in social media . I have been asked this a lot over the last decade . Career progression has historically been generally all tied to traditional metrics likes sales and delivery numbers and people management and so on . But indirectly , social media has only helped my case .

12. Do you use your blog to evangelize your employers products and services ?

In general, I don’t . I don’t think I sound credible pimping what we sell . However – I am very proud of where I work and what we do . So that might occasionally reflect in what I say . There are a few notable exceptions to this . Last year, an analyst criticized Watson in his report and I felt strongly that it was unfair – so I posted a rebuttal in my blog . I did explicitly state though that I am an executive at IBM and I own stock in the company . I have also written about SAP HANA when I worked at SAP Labs in the engineering team .

Last time, we discussed how Pythagorean theorem helps us in every day life. Today, I would like to invite your attention to Pi , a beautiful constant (yet one we cannot fully measure) that is in practically everything we see and use.

Image courtesy https://firstnewnan.com/casual-pi-day/

So, what is Pi ?

The common definition is that it is the ratio of the circumference of a circle to its diameter. How cool is that ? ALL circles have the same ratio of circumference to diameter – and thus all circles are similar figures. In Math we represent it as the greek letter  π .  There is a lot of interesting trivia to know about pi – so lets start there

Pi goes on and on

π is an irrational number ( a geeky way of saying it cannot be represented as a regular fraction like 1/2 ). It goes 3.1415926535897932384626433… with no repeating pattern emerging in its decimals.  It can be approximated to 22/7 for use in daily math. Its a standard test for supercomputers to see how many digits after decimal point of pi can be computed. Practically only a few hundred are needed even for the most complex applications though.

Pi is the reason you can’t square a circle !

π is not just irrational – its also transcendental ( yet another geeky way of saying it cannot be expressed as the root of a polynomial ). Not all irrational numbers are transcendental – like for example the square root of 2 is irrational, but not transcendental. Its a very special class of numbers – mostly because it is very hard to prove a given number is transcendental. You may have heard of “Squaring the circle” as a way to say “trying the impossible”. It is because of pi being transcendental that you can’t create a square with the exact same area as a circle with a compass and straight edges. 

Pi has Indian connections 

While the origin of pi is attributed to the Greek mathematician Euclid, several Indian mathematicians like Aryabhatta, Madhava led the effort in providing proof and to calculate its value – usually based on infinite series of numbers. Its also interesting how the algorithms used to calculate pi has changed over time. It started with infinite series, then moved to iterative algorithms – and then switched back to infinite series again thanks to the use of an equation developed by the genius mathematician Srinivasa Ramanujan

OK, so now about the use of Pi in daily life

Finding the area, volume, circumference of anything that has a curve

Anything that is curved has some association to a circle in math – and circles all have pi as the ratio for their circumference to diameter. Consequently calculations for all those curved things like circles, spheres, cones, bell curves and so on ALL have pi in it.

Pi is also useful with straight lines and angles

While we commonly talk about measuring angles in degrees, math geeks measure it in radians. Quite simply a full circle is 360 degrees and in radians it is 2π radians. In other words 1 degree is π/180 radians. Thanks to pi finding its way into measurement of angles – it features in most of trigonometry as well – even though all you see is straight lines and angles between them. This extends to Calculus and other branches of math which we will explore later. Pi is the one constant that is everywhere !

Pi in the sky…and elsewhere

Every aspect of transportation uses Pi in its calculations. This one is personal for me – being a mechanical engineer by trade. Think of a plane or a car – everything from calculating surface area to wind resistance includes pi (remember all curves lead to pi !). Not only that – pi is integral to the calculation of all navigation be it in air, water or land – including finding the distance between stars and planets etc ! This is especially critical for planes that always have to fly in arcs, and where fuel consumption calculation can be a life or death issue.

Pi and the length of rivers

Prof Stolum of Cambridge University showed using Fractals that the ratio between the actual length of rivers from source to mouth and their direct length as the crow flies can be approximated to pi !

Pi is a friend of random numbers

We saw how Pi helps with curves and angles between lines. But it also shows up in seemingly unrelated domains. Here is an example – among a collection of random  numbers, the probability of two numbers with no common factor is 6/π^{2 .} If you are a math geek – you can find many other examples like this – like Cesaro’s theorem and Buffon’s needle problem where pi comes up unexpectedly.

Pi as a safety net 

Whether we are designing a beam which should not break apart from vibrations ( My mind is racing back to my machine design classes) , or a video game (much more pleasant memories from creating games on BASIC) that should not crash when users do random things – the engineers factor in some “randomness” into their model to account for real life. No surprise – all those models typically include pi ! This is just a result of something we spoke above – such probability distributions typically use “area under a curve”, and that by definition needs pi

In my job, I spend a lot of time explaining technology topics to my clients in simple english. Off late, a lot of such conversations are about AI, Data science, Quantum Computing etc . Those topics are rooted in maths and physics (amongst other things), and I often find there is some fear about math and science that exists in the minds of some people listening to me, and it gets in the way of their appreciation of technology.

I am also the dad of a teenage daughter who loves math and science. From my daughter and her friends and teachers – I got the feeling that many a time students get education in math and science in quite an abstract way, and it leads them to think “Why should I really learn any of this? I am not going to use this in real life”. In a few weeks, I am going to give a talk to high schoolers on how the math they learn in school manifests in real life in ways they may not have realized .

So I am going to try a couple of posts here to see if I can explain how simple math leads to powerful and beautiful things we see and use in our daily lives. I would really love your feedback on each topic including alternate/better explanations, and also your suggestions on what else would make good examples. If anyone wants to post a guest blog – we can consider that too.

Let me ease into it with simple math and see how it goes . We can build up from there . Here we go !

Pythagorean theorem

Lets start with the very simple and quite powerful Pythagorean theorem . It states that the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. We remember it via this elegant equation

 A²  + B² = C² 

This theorem has been proved in several ways , so we will skip that part and get to the fun aspects . If there are three positive numbers A, B and C where A²  + B² = C²    is true, then it means that there exists a right angled triangle with A and B as the short sides and C as hypotenuse. Some of the fun is based on this converse property of this simple theorem.

How to make square edges on your garden bed

Any three numbers which make true is called a pythagorean triple. The numbers 3,4,5 form one such triple ( 3 squared is 9, 4 squared is 16. the sum of 9 and 16 is 25 which also happens to be the square of 5 ).

Here is a simple problem – lets say you are making a garden bed to plant vegetables.  How do we make the edges square if all you have is a tape measure ? Easy – just make a a triangle with sides 3, 4 and 5 units using the tape and mark the end points on the ground. Voila – You have edges at perfect square !

How big of a ladder do you need ?

An extension of this is also true for finding the length of a ladder required to paint a wall – probably a question kids get in school exams. If the point where the ladder needs to touch the wall is 4 meters, and the bottom of the ladder is 3 meters away from the wall on the floor – the length of the ladder needed is 5 meters !

Or let’s say you want to convert stairs into a ramp on your back porch – the same concept applies .

Real engineers use this information frequently – the one I remember the most from my college days is in surveying land, finding length of trusses etc .

Planning your next painting project

Lets say we draw three similar figures using the sides of the right angled triangle forming one side of those figures. Similar figures just mean the lengths of sides have same ratios, the included angle between sides are the same.  Easy way to think about it is zooming a picture on your phone . All parts increase or decrease in size – but their ratio to each other stays the same . It does not matter what the figure is – it could be a square, a pentagon or another triangle. The area of the largest figure (the one using hypotenuse as one of its sides) is ALWAYS the same as the sum of areas of the two smaller figures. How cool is that ! See this picture from wikipedia to see what I mean

Lets say these three squares are walls you need to paint . For the same quantity of paint you will need to paint the largest square – you can paint both the smaller squares !

How much marinara do you need ?

It’s not just about squares either – this area computation via Pythagorean triples also applies to circles . So for the the quantity of marinara you need for a 5 inch pizza can be used to coat both a 3 inch and 4 inch pizza ! If your mom is like mine – I wouldn’t advice trying this math on her while she is making you pizza . Theory of “mom is always right” over rules every other rule 🙂

If you are a social media marketer

You probably are a fan of Metcalfe’s law which says the value of a network is proportional to the square of the number of connected users in it . Let’s say you are given access to three potential networks . A has 3 connections , B has 4 connections and C has 5 connections . Since The squares of A and B add to the square of C – you get as much out of a network with 5 connections as you would get from A and B which together add to 7 connections . Spend your time and money wisely !

PS : I have my own misgivings on this – but would like to hear your feedback anyway . I didn’t come up with this myself and can’t remember anymore who told me this originally . But I have teased many a marketer friend with this at social events 🙂

What’s next

I think I would like to example the wonderful pi next . There is pi in pie !