[Content from the M.4 course, term 2, additional math]

See, many of you are having a headache about the "function" and "relationship" that have just been opened, right? (especially sending you beautiful summary notes) Seriously...Many people die from the first page! 555 + I found the word "ranked pair." "Cartesian product" is...Drunk

Today, Teacher Heem asked to "summarize the content," an important concept.

🎯 1. The heart of the "rank pair" (it's shoes!)

The first thing you need is a pair of ranks.

Key Takeaway: 💥 Sequence Major Descent Do Not Toggle! 💥

Teacher Heem, please give an example...It's like wearing shoes!

We have two things: 'left shoe' and 'right shoe.' If we match the pattern (left, right), it's wearing normal shoes. Are you patched?

But if we switch at it! (right, left)...I mean, put the right side on the left foot, put the left side on the right foot...Ask if it's the same? 555 + Not like! It's broken! It can't walk!

✅, this is a "rank pair," the front has to be in front, the back has to be behind, switch immediately, meaning change immediately, or break! Remember that!

🚀 2. "Cartesian product" (luxury name, but actually 'match up')

Once we understand "do not switch places," we move on to "Cartesian products" (a very spectacular name, but a very simple concept).

Key Takeaway: 🎯 It's a Mao-Out Factory 'Match Every Possibility'!

Think of the picture according to Teacher Heem...

Let's say I have a group of shirts (in this group there are T-shirts, shirts), and then I have another group of pants (in this group there are jeans, shorts).

If the teacher says, "Match all kinds of shirts and pants!" (Repeat, "shirts" before "pants")...Because we have learned that the order is important!)

We just catch it:

(T-shirt, jeans)

(T-shirt, Shorts)

(shirt, jeans)

(shirt, shorts)

✅ end! This is called "Cartesian product." It's a "collection" of all possible matches, based on the sequence (the first group is in front, the second group is behind). That's it! Easy? 555 +

🤯 3. So what does it have to do with "relationship"? (Goosebumps!)

Ah, this is Kyle Max!

Key Takeaway: 🌟 The 'product' we matched up (number 2) is our 'warehouse'...The 'relationship' part is that we 'pick up' things in the warehouse!

From the example of the shirt and pants...Do we have a warehouse with four pairs?

"Relationship" is that we set a "condition" for picking things out of this warehouse, for example, Teacher Heem might say, "Only a couple wearing a T-shirt."

We just walk to the warehouse and pick up:

(T-shirt, jeans)

(T-shirt, Shorts)

End! These two pairs are the "relationship" we want!

The summary is:

Rank Pair: Important Sequence, Do Not Toggle (Like Shoes)

Cartesian product: is to match all kinds of maps (build a warehouse)

Relationship: Is to choose a favorite pair from in the warehouse (conditional).

How is it?! 555 + The function starts with a small point. If we understand how "order" is important and how "matching" works, it's comfortable! Go on for a long time! 🤘

# Math teacher heme # Tutor # Function # Relationship # Double ranking# Cartesian product # Math summary # MathNote # Dek68 # Dek69 # TCAS # Late Math # Simple understanding teacher heme style