xyymath
the proof is left as an exercise for the reader
11 posts
| I adore math fight me (with proofs obviously) | math jokes | math struggles | side blog | main blog @xypheris |
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xyymath · 13 minutes ago
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Mathematician: I don’t understand why engineers round off π to 3.14. Engineer: Because we like our bridges to actually get built before the sun explodes.
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xyymath · 8 hours ago
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A mathematician and an engineer are asked to design a cable system for a city.
The engineer calculates the shortest paths and designs a practical layout.
The mathematician claims the solution is trivial under the Steiner Tree Problem, writes “proof left to the reader,” and walks away.
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xyymath · 1 day ago
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An engineer and a mathematician are walking over a rickety old bridge.
Engineer: "Don’t worry, this bridge was built with a safety factor of 2." Mathematician: "So the probability of collapse is 0.5?”
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xyymath · 1 day ago
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An engineer, a physicist, and a mathematician are given $10,000 to design an energy-efficient home.
The engineer builds a compact structure with good insulation.
The physicist calculates the optimal shape for heat dissipation and builds a geodesic dome.
The mathematician proves that a house can theoretically exist in four dimensions and submits a paper.
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xyymath · 2 days ago
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Circles
An engineer, a physicist, and a mathematician must enclose a flock of sheep using the smallest possible amount of fencing.
The engineer builds a circular fence, minimizing perimeter.
The physicist calculates the optimal shape and adjusts the fence for air resistance.
The mathematician builds a small fence around themselves and declares, “I define myself as outside.”
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xyymath · 2 days ago
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At the Races
An engineer, a mathematician, and a physicist are betting on horse races.
The engineer measures the horse��s weight and muscle power to pick their favorite.
The mathematician analyzes the statistics of every race in history.
The physicist assumes all horses are spheres.
None of them win.
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xyymath · 3 days ago
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An engineer, a physicist, and a mathematician are sitting in a bar when the bartender announces, "First beer is $5, and every refill is half the price of the previous one." The engineer: Sweet, I’ll drink forever for $10! The physicist: Actually, it’s $10 to infinity. The mathematician: You fools, it’s $10... but only in the limit.
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xyymath · 3 days ago
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Polar Graphs: When Math Decided to Flex Its Artistic Side
The Polar Rose (r = asin(nθ))
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2. The Lemniscate (r² = a²cos(2θ)) : It’s like infinity had a baby with a pretzel
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3. The Cardioid : r = a(1 + cos(θ))
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4. The Spiral of Archimedes (r = aθ)
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5. The Butterfly Curve :
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xyymath · 6 days ago
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Hi, someone called?
REBLOG THIS POST IF YOU ARE A MATH ENJOYER
No it is not optional, I desperately need to follow y’all so that there is more math on my dashboard.
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xyymath · 6 days ago
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Things Math Professors Say
"The proof is trivial." (Oh, cool. Guess I’m just an idiot then.)
"Left as an exercise." (Translation: You’ll never solve this in a million years.)
"It’s obvious, really." (Sure, if you’re a demigod.)
"By inspection." (Stares harder at problem… still nothing.)
"For small values of epsilon." (How small? Subatomic? Microscopic? Vibes?)
"WLOG (Without Loss of Generality)." (Oh, we’re just assuming it doesn’t matter now? Alright.)
"Details omitted." (Because apparently, you don’t need to understand it.)
"By the usual argument." (Which you somehow don’t know because you weren’t born in 1702.)
"Assume the rest holds." (That’s some impressive optimism right there.)
"The usual abuse of notation." (Why does this feel like an emotional wound?)
"Almost surely correct." (But also possibly wrong? Cool, thanks for the clarity.)
"A non-rigorous approach." (I thought math was supposed to be precise?!)
"Assume it’s obvious." (Buddy, NOTHING about this is obvious.)
"The reader may verify." (No, the reader may CRY.)
"To the interested reader." (Guess I’m not interested enough, huh?)
"Well-behaved functions only." (We’re function-shaming now?)
"Obvious to the trained eye." (Guess I’ll never make it out of amateur league.)
"A trivial case analysis." (Trivial to WHO??)
"Integrate by parts, twice." (Bold of you to assume I got it the first time.)
"As you can clearly see." (Oh, I clearly see my FAILURE, alright.)
"It works in practice too." (Unlike me, who barely works at all.)
"Assume a spherical cow." (Are we doing math or abstract sculpture?)
"A standard result." (Not in my standards, pal.)
"We skip the tedious algebra." (No, no, please—I wanted to suffer MORE.)
"Assume non-zero solutions exist." (Okay, now we’re just assuming life works out.)
"The usual topology." (Bro, I don’t even know the unusual topology.)
"Finitely many cases left." (Just kidding, there’s 72.)
"By virtue of symmetry." (Virtue? I have none left.)
"Don’t worry about the constant." (The constant is probably my GPA dropping.)
"Assume continuity." (I’m assuming my brain is breaking.)
"Smooth functions only." (Guess I’ll leave, I’m clearly not smooth enough.)
"The simplest non-trivial case." (Simplest? NON-TRIVIAL? Pick a side!)
"Epsilon goes to zero." (Epsilon isn’t the only one losing it.)
"And the rest follows." (Where? Straight to my breakdown?)
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xyymath · 6 days ago
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Reduced Row Echelon: We Need to Talk
I don’t know who needs to hear this, but there is a HUGE difference between "ROW ECHELON FORM" and "REDUCED ROW ECHELON FORM."
Row Echelon Form? That’s when all the non-zero rows are stacked up top like overachievers, zeros chilling at the bottom, and every leading entry is to the right of the one above it. Simple enough.
Reduced Row Echelon Form? Oh, buddy. It’s Row Echelon Form’s glow-up. Every leading entry is now a 1 (living their best life as pivots), and everything above and below them is a 0. It’s like Row Echelon Form decided to tidy up its room and go full-on minimalist.
Why the confusion, you ask? BECAUSE MATH PROFESSORS LOVE TO SAY, “Now we’ll reduce the matrix to Row Echelon Form,” so naturally, I thought "Reduced Row Echelon Form" was just the bougie version of the same thing. Like, come on, you’re throwing reduction in the phrasing—it’s confusing!
So here I am, thinking I’m killing it in class, and suddenly I find out there’s another level of reduction? Like, hello, I’m not a washing machine—I didn’t sign up for the extra rinse cycle.
UGGGHHH.
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