## Chess: mobility: opening files?

The tutor discusses the (dis)advantage of opening files. I suffered some chess burnout earlier this holiday season, but hope I’m making a recovery. I still lose more than I win, but computers aren’t prone to error the way a human …

## English: Homonyms (or homophones): peel and peal

Call them homonyms, homophones, or what you will; the tutor introduces another pair. My coverage of homonyms began with my post of August 21, 2013. Searching up homophone and/or homonym on this site reveals my love of them. Playing the …

Tagged with: , , ,

## Mobile phone apps: Nexus 4 onboard calculator: trig functions

The tutor offers a hint about using the Nexus 4 onboard calculator for sin, cos, and tan. One of my New Year’s resolutions is to get acquainted with my mobile phone. Believe it or not, I’ve been lounging on the …

## Math: linear diophantine equations: integer solutions to Ax+By=C

The tutor delves deeper into when integer solutions can be expected for Ax+By=C. In my dec 16 post I discussed finding integer coordinates for a linear equation in the form Ax+By=C. I pointed out that not always can integer solutions …

## English: what is a barnburner?

The tutor shares another term from the farming culture he grew up in. I don’t often hear the word “barnburner,” but of course I don’t live in the culture it’s probably from. Neither my Webster’s, nor my Collins, contains it, …

Tagged with: ,

## Statistics: Proof of V(X)=E(X²)-[E(X)]²

The tutor offers proof of a formula he recalls from Stats. In my university Stats courses, a formula referred to often was V(X)=E(X^2)-(E(X))^2 in which V(X)=population variance E(X^2)=expected value of X^2 E(X)=expected value of X Here’s how I believe one …

## Home computer use: Computer security: Bitdefender re-install

Amid a busy life and Bitdefender’s solid reliability, it wins again. Coincidentally, on this first day of Christmas break, my Bitdefender 2015 subscription finally expired. Back in my Dec 6 post, I told of plans to get out to check …