Problem:

Solution:

Definition:

Remarks:

Lemma Theorem

疑问:

Assumption:

Proof:

<font color=LightCoral>**Problem:**</font>

<font color=LightBlue >**Solution:**</font>

<font color=Lime  >**Definition:**</font>

<font color=LightSalmon >**Remarks:**</font>

<font color=Aqua >**Lemma Theorem**</font>

<font color=Red >**疑问:**</font>

<font color=DarkViolet >**Assumption:**</font>

<font color=HotPink >***Proof:***</font>