Wed. Jul 30th, 2025

Fundamental limit rules with funny intuition

Let’s go over the fundamental limit rules (sum, difference, multiple, quotient, power) with their mathematical formulas and a funny or intuitive twist for each one.

🎯 1. Sum Rule

📏 Rule:

\lim_{x \to a} [f(x) + g(x)] = \lim_{x \to a} f(x) + \lim_{x \to a} g(x)

🤣 Funny Intuition:

Limits are like emotions in a group chat. If two people are chill separately, they’ll still be chill together. 😎 + 😎 = 😎
“If Bob and Alice are both stable, their sum won’t explode.”

🎯 2. Difference Rule

📏 Rule:

\lim_{x \to a} [f(x) - g(x)] = \lim_{x \to a} f(x) - \lim_{x \to a} g(x)
🤣 Funny Intuition:

Subtracting two calm people still results in calmness. No drama.
“Like splitting the bill with a friend who owes you money—still balanced.”

🎯 3. Constant Multiple Rule

📏 Rule:

\lim_{x \to a} [c \cdot f(x)] = c \cdot \lim_{x \to a} f(x)
🤣 Funny Intuition:

A constant just tags along like a chill sidekick. Doesn’t change the plan.
“If Batman’s going to Gotham, Alfred goes too—but quietly.”

🎯 4. Product Rule

📏 Rule:

\lim_{x \to a} [f(x) \cdot g(x)] = \lim_{x \to a} f(x) \cdot \lim_{x \to a} g(x)
🤣 Funny Intuition:

If both functions are on time, their product won’t crash the party.
“It’s like teamwork in a 3-legged race—both need to cooperate to cross the finish line.”

🎯 5. Quotient Rule

📏 Rule:

\lim_{x \to a} \left[ \frac{f(x)}{g(x)} \right] = \frac{\lim_{x \to a} f(x)}{\lim_{x \to a} g(x)}, \quad \text{as long as } \lim_{x \to a} g(x) \ne 0
🤣 Funny Intuition:

You can’t divide by someone who’s ghosted.
“Trying to split a pizza with a friend who disappears is just sad… and undefined.” 🍕➗👻 = 🚫

🎯 6. Power Rule

📏 Rule:

\lim_{x \to a} [f(x)]^n = [\lim_{x \to a} f(x)]^n, \quad \text{for any integer } n
🤣 Funny Intuition:

If a function behaves well, then squaring it just makes it “extra nice.”
“It’s like your grandma’s cookie recipe—already good, now doubled!”

🎯 7. Root Rule

📏 Rule:

\lim_{x \to a} \sqrt[n]{f(x)} = \sqrt[n]{\lim_{x \to a} f(x)}, \quad \text{as long as the result makes sense}
🤣 Funny Intuition:

Roots don’t mess with chill functions.
“If your limit is polite, the root won’t spit in your face.” 😇

BONUS 🎁: Combine These Like LEGO Blocks

All these rules can be stacked. Like:

\lim_{x \to 3} \left[2f(x)^2 + \frac{g(x)}{h(x)}\right] = \text{Just break it into pieces, limit each one, and put it back together.}

Limits are lazy. They love small talk—just break things up, simplify, and ask each part what’s up.


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