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blackpenredpen
@blackpenredpen
Education
2.4K
Video Count
231.8M
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1.4M
Subscriber
#9,855
United States Rank
#40,783
Global Rank
2.4K
Video Count
231.8M
Video View
1.4M
Subscriber
#9,855
United States Rank
#40,783
Global Rank
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Title A-Z
1:20
Can you solve ln(x)+ln(-x)=0
24.9K
1.1K
17
3 days ago
8:24
Moving Stick Problem (the simplest case of the Moving Sofa Problem)
10.2K
597
35
1 week ago
6:48
26/65=25 is "lucky" but how to find other lucky fractions?
9K
517
56
1 week ago
1:35
Solving 2^x=x^32 (just the integer solution)
16.9K
938
16
2 weeks ago
9:14
"Youtube is full of the same wrong method" Solving 2^x=x^32 the proper way!
14.6K
711
85
2 weeks ago
5:57
Basic textbook homework problem but I blank out...
6.4K
428
41
2 weeks ago
6:49
x=x+1 has absolutely no solutions, how about sqrt(x)=x+1?
82.4K
2.3K
278
3 weeks ago
1:28
You can solve this integral by “magic”
53.5K
2.6K
36
3 weeks ago
4:30
Coming up with an "exponential formula"
5.1K
347
26
4 weeks ago
1:26
A complex way to integrate 1/(x^2+1)
35.7K
1.6K
29
1 month ago
14:19
Proving the quadratic formula using Euler’s formula!
25.4K
1.7K
175
1 month ago
2:18
Finding the mystery function from a Harvard-MIT math tournament problem
12.4K
750
24
1 month ago
8:19
Just factor x^5+x^4+1 in Z mod 3
5K
324
25
1 month ago
1:47
One satisfying factoring problem x^5+x^4+1
112.5K
3.7K
53
1 month ago
1:32
e^pi vs pi^e
103.3K
4.2K
115
1 month ago
6:00
Next up x^4=x. I don't see why not!
45.5K
1.4K
162
1 month ago
9:50
I thought 0^x=2 was impossible!
49.5K
2.1K
310
1 month ago
1:20
Can 0^x=2?
103.8K
3K
175
1 month ago
9:12
Is 1-1+1-1+1-1+...=1/2 really true?
30.1K
975
164
2 months ago
9:33
How to solve a functional equation on the AIME
15.6K
686
51
2 months ago
8:28
My All-In-One Calculus Problem! (now in a matrix!)
30.8K
1.3K
96
3 months ago
6:41
Proving the quadratic formula using calculus? (just my attempt)
34.3K
1.7K
137
3 months ago
5:28
Can we have a right triangle with sides 1, x and x^2 (but the hypotenuse is x)
14K
613
114
3 months ago
6:17
So I tried integration by parts (solved another integral instead!)
12K
518
60
3 months ago
6:36
So you want another logarithm triangle (w/ law of cosines this time!)
11.2K
543
53
4 months ago
15:27
Finding the volume of a 4d sphere
14.1K
881
97
4 months ago
9:54
My first triple improper integral!
11.3K
733
70
4 months ago
13:59
This calculus proof is only for math majors (National Taiwan University entrance exam)
6.6K
392
32
5 months ago
8:05
Can x factorial = 0?
10.8K
641
142
5 months ago
14:15
I made a volume of revolution problem "MORE FUN"
5.7K
380
32
5 months ago
10:31
The first calculus question on a National Taiwan University entrance exam (for transfers)
7K
348
29
5 months ago
19:53
A taste of calculus 1 problems for math majors!
8.9K
470
48
5 months ago
11:44
Brilliant minimum problem
6.9K
508
43
5 months ago
13:30
I created this double integral, am I the next Gauss?
9K
593
63
5 months ago
6:34
Why do mathematicians think disc=square?
9.7K
437
96
6 months ago
4:28
How to welcome a math PhD friend at the airport! @drpeyam
17.8K
754
140
6 months ago
15:14
THIS LIMIT IS WRONG but how do we prove it?
13.1K
603
86
7 months ago
10:31
Can f'(x)=f^-1(x)?
23.8K
1.3K
77
7 months ago
12:45
Only math majors would do this! (epsilon-delta proof for a simple limit)
4K
252
18
7 months ago
7:41
How to find a delta for a specific epsilon (epsilon-delta definition of a limit)
2.5K
179
14
8 months ago
11:39
Epsilon-delta proof without THAT TRICK!
8.1K
488
34
8 months ago
22:51
Brilliant Trig Identity Challenge!
4.2K
285
34
8 months ago
8:55
That chain rule joke!
23.2K
1.3K
77
9 months ago
6:56
Trying my first abstract algebra problem in 14 years!
57.9K
2.6K
349
9 months ago
11:41
Why are integrals SO HARD? (My 5 reasons and how to prepare for integrals)
20.9K
1.1K
131
10 months ago
2:36
I’m sorry, I have been saying “let x=1” wrong for 13 years
101.6K
5.4K
919
10 months ago
7:22
Can x^y=yx?
73.6K
2.7K
292
10 months ago
9:39
The square root of the 2 by 2 zero matrix
20.2K
1.2K
98
10 months ago
16:37
Calculus students don’t use these inequalities anymore!
23.3K
1.3K
73
11 months ago
10:58
Factoring a trinomial (what I learned in Taiwan vs in US)
46.8K
1.6K
237
11 months ago
