You jumped in on a simple problem I posed for soldier, so far I am underwhelmed. At least where I was simultaneous equations are routine and ordinary.

I have first year students who could run circles around you and you want to come after me. You couldn't even understand half of US's questions. This would be a good time to stop embarrassing yourself.

Or not. Everyone loves a good train wreck.

Don't have a clue as to who you are. You jumped into a conversation you were not party to, and loudly solved a simple problem I asked those who know it not to.. That is your trip.

If that's an apology for throwing crap at the walls, it needs work.

I made a successful career appplying math and science, and building useful things. I am satisfied with my accomplishments, and the peer recognition I enjoyed.

Math is a tool, it is what you can do with it that matters.

I did not ask you a question, I asked soldier. You presumed to answer when I asked those who know it not to.

You asked a question on an open thread started by someone else, in an attempt to bust the o/p ... after proving you couldn't even comprehend the o/p's questions. Everybody who could comprehend his questions knew you were bullshitting right then.

And you knew it when you posted your own question, which you then showed you didn't know how to answer. Or more kindly, that you could kind of recall how to answer, but couldn't be arsed to review well enough to get it right.

\(A^{-1}b \neq bA^{-1}\) because matrix multiplication isn't commutative. It's not even defined for rectangular matrices if they don't have the right shape.

The "linear" in linear algebra refers to the degree of the variables, not the geometry.

\(x+y+z=1\) is not a line, it's a plane in 3-space perpendicular to the line \(t(1,1,1)\).

Nobody successfully navigates high school without knowing the multiplicative inverse of \(x\) is given by \(x^{-1}\), not \(x'\).

I mean, really. This is a train wreck.

I am a retired engineer. I spent 30 years paying attention to details in competitive environments where it mattered. Intel and Lockheed in the 80s. If you think you are being competitive in an anonymous forum you really are not.

It's about correcting errors. You're not even close to the first student I've corrected this week, the principal difference being that my students actually fix their mistakes after they're pointed out rather than bulling on after a correction.

I make a reasonable effort on the forum, but I do not worry about being wrong. Some act like the form is completion.

You were bored? After 30 years of continuous problem solving I write code to keep boredom at bay. You can look at my preliminary cut at simulating gas molecules in a tank on the programing thread. The kind of modeling I would do on a design problem.

Back in the 80s before widespread PC math tools I wrote my own math library in C. I read numerical methods books and ported FORTRAN to C. There was a book Numeral Recopies In C but it was buggy. That was some 45 years years ago.

I used a slide rule in high school and my first try at college before I went to the Navy.

Something I and peers in y engineering hertion have noticed. New colleg grads seem to be missing something, . An inability to ijdendently attack a problem when tere is no exiting comnter tool or app or solution online avilble. Certainly not all, perhaps a trend.

There is the engennering sterotype of the pendantc engineer always correcting others, but unable to actually get anything done.

This is Internet Infidels. I've been away awhile, but back in the day, the joy of this board was in asking random questions and watching people from the top of their field rap back atcha, often enough the same day.

A question I asked on Mitochondrial Eve got a response from one of Rebecca Cann's former grad students before I went to bed that night. Per Ahlberg used to hand out preprints to his most recent research on Devonian transitionals back around when Tiktaalik was first discovered.

And you want to bitch because a math professor showed up to bust your chops after you posted some errant nonsense.

FFS, suck it up.

I will have a question for you on the math forum tomorrow on La Place Transforms. Perhaps you can answer. I have ben triyng to code the forward and reverse trasforms from scratch as an exercise.

If you can find the mistakes I included in my answers to the o/p's questions, I'll consider it.

I use that method as a tool to assess comprehension, because students who've truly mastered material know enough to spot my deliberate errors.

And yes, anyone else reading this thread is welcome to "bust the professor" as well. It's okay, that was always the plan.