# 數之釜 MathPots

### 0.999…. is equal to 1 or not?

0.9999……=1? This question shows up every year. It’s a 0.9999……=1 anniversary, right? Today MathPots also want to try to cook this stuff to everyone.

### 0.999999…..=1? 每年都要辦的0.9bar周年慶！

0.999999….. = 1? 這個問題幾乎每年都會在民間被拿出來吵一輪，對長期有在數學相關社團或群組的人來說可能已經感到有些厭煩。出現的頻率讓人覺得… 根本是0.9bar周年慶吧 XD 熱潮又漸漸過去，數之釜今天也來挑戰炒冷飯，看是否能炒出老少咸宜的滋味。

### [calculus]The example of ε-δ definition problem

In the last meal [calculus]The clarification of ε-δ definition, we knew the actual meaning of $latex \varepsilon -\delta$ definition. This time we are going to use it. In this dish, I will show you the basic problem in $latex \varepsilon -\delta$ definition. Hope to make you understand clearly!

### What is Thales’ theorem? The little relationship between circle and right triangle.

Maybe some people would say that “who is Thales? I have only heard about T

### [calculus]The clarification of ε-δ definition

I believe that you learned the simple concepts of limit, integral and differenti

### [微積分]ε-δ定義的觀念釐清

If you search well on YouTube, you can find many great channels. Even if are bad in foreign language, you mus try. It will take you into another world and broaden you.

### 0.999…. is equal to 1 or not?

0.9999……=1? This question shows up every year. It’s a 0.9999……=1 anniversary, right? Today MathPots also want to try to cook this stuff to everyone.

### 0.999999…..=1? 每年都要辦的0.9bar周年慶！

0.999999….. = 1? 這個問題幾乎每年都會在民間被拿出來吵一輪，對長期有在數學相關社團或群組的人來說可能已經感到有些厭煩。出現的頻率讓人覺得… 根本是0.9bar周年慶吧 XD 熱潮又漸漸過去，數之釜今天也來挑戰炒冷飯，看是否能炒出老少咸宜的滋味。

### [calculus]The example of ε-δ definition problem

In the last meal [calculus]The clarification of ε-δ definition, we knew the actual meaning of $latex \varepsilon -\delta$ definition. This time we are going to use it. In this dish, I will show you the basic problem in $latex \varepsilon -\delta$ definition. Hope to make you understand clearly!

Elementary

### What is Thales’ theorem? The little relationship between circle and right triangle.

Maybe some people would s

### [calculus]The clarification of ε-δ definition

I believe that you learne

### [微積分]ε-δ定義的觀念釐清

House Special

If you search well on YouTube, you can find many great channels. Even if are bad in foreign language, you mus try. It will take you into another world and broaden you.

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