 Here we are back in my folder structure. We can see the home button there I'm inside of this folder the new file. We've just created is right there But I'm going to show you lesson one now You can just start a new new folder a new Notebook there, but I've already created one that we can use in lesson one. Let's open that up There we go took some time to load kernel starting. Please wait Everything is installed. Let's go and these are all the things we're going to get up to now Look at this. This is what a notebook looks like. I'm writing code But I'm also writing these little headers and sub headers What you can see is even some text in between that have got bullet points in them. It all looks very neat Look at this. This is what a notebook is a Jupiter notebook And that is what makes scientific computing so exciting these days You can write a whole manuscript with your code right in between and these are all the things We're going to get up to when we look At our first lesson. We're going to just use Julia as you can see as a giant calculator It is a scientific programming language a technical computer language And that is what we're going to start off with as opposed to the normal hello world So here's a line of a cell code You can see these this faint line that appears and if I move across to this You see the faint line that sell of that code cell and you can see here that it was a markdown cell as opposed to a code cell So in inside of a markdown I can write normal text But I can also give it a size by using using either markdown or html tags Let's double click on this and there you see all I've done is used html tags open h1 hitting 1 That's the largest font it will render for me close h1 The alternative is let's take those away I'm just going to go to the front there and use a markdown little shortcut called the hash tag See there it jumped already to h1. That's the largest kind of text That would be the same as h1 hitting 1 now How do I execute that line of code because if I hit return or enter? This is going to jump to the next line. Let's hit the backspace. I can do it in two ways I can either hit the play button there or if I'm in the cell I hold down the shift key on macOS Keyboard I hit return on windows and linux. I will just hit the enter key So I'm holding down shift hitting return and that line that cell of code executes beautifully Let's double click on this one. You see there two hash tags That would be the same as H2 heading to so I can just go to the end and just close heading to there These are html tags many people are familiar with html tags. I can execute the cell there There we go. Look at this. It's even smaller and you guessed it. It's three That's the would be akin to an h3. So three little you can go up to six h6 The smallest subheadings you can do let's just run that line of code So first off we're going to look at simple arithmetic just doing simple basic Additions and subtractions we're going to move on to doing this through the built-in functions Next up. We're going to look at associations. We can round off numbers We're going to calculate the greatest common divisor and the least common multiples We'll have a look at absolute values some trigonometric functions and they are all there not just the ones I've listed here We can calculate the sign of a value and there's a few caveats there something I just should make your way of we're going to use numeric comparisons where we compare values to each other a Lot about that we're going to look at special powers. Those are your square roots your cube roots and Exponentials and logarithms will have a quick look at I'll tell you quickly about all these special functions Complex numbers if you're interested in those and we're going to talk a lot about plotting in future lectures But I'm going to give you a brief look at how to plot some of these mathematical functions