JiroFukuda Math Channel

Proof that a^a + b^b + c^c ≥ 3 when a + b + c = 3

The Relationship Between Arithmetic and Geometric Progressions

早稲田大学2026商学部第3問〜円錐を母線に平行な平面で切った切り口の面積の最大値

Solve the functional equation xy=f(x)f(y)-f(x+y).

Do there exist real numbers a, b, and c that satisfy a^b = b^c = c^a and are not all equal?

早稲田大学2026商学部第2問〜漸化式と数列の最大値

不等式の証明と根号を含む数値計算の値の評価

Proof that f(x) is identically zero when the function defined by a definite integral is monotonic...

Waseda University 2026 School of Commerce Question 1 (4) — Sum of dot products of vectors from th...

Let's Prove Rolle's Theorem!

Calculating Definite Integrals of Trigonometric Functions

Waseda University 2026 School of Commerce, Question 1 (3): Minimum length of a polygonal line con...

入れ子の根号不等式を解くコツ教えます。

Let's Solve This Functional Equation!

早稲田大学2026商学部第1問(2)〜11次方程式の解の2乗を解に持つ11時次方程式

Let's Solve Integral Equations!

5個の実数の3個から残りの2個を引いた10個の数の積は5個の実数の平方の積以下であることの証明

Waseda University 2026 School of Commerce Question 1 (1) — Maximizing the Area of a Shape Enclose...

Proof That Adjacent Terms in a Sequence Defined by a Three-Term Recurrence Relation Are Relativel...

Proof That If 42 People Sit in a Row of 45 Cinema Seats, 10 Consecutive Seats Must Be Occupied

Waseda University 2026 Faculty of Education Problem 4: Application of Limits to Geometry

How many integers between 50 and 500 have strictly decreasing digits?

Find all pairs of positive integers (m,n) satisfying 2^m+3^m+5^m=n!

Waseda University 2026 Faculty of Education Problem 3: Vector Equations of Lines in Space

Proof of the Existence of a Non-Empty Subsequence with a Sum of 0

Let's find the polynomial P(x) that satisfies (x+1)P(x)=(x-10)P(x+1)

Waseda University 2026 Faculty of Education Problem 2: Remainder of Polynomial (f(x))^n Divided b...

Proof that the Limit of the nth Root of n is 1

平面幾何の証明に挑戦しよう！

Waseda University 2026 Faculty of Education Problem 1(4): Conditions for exactly 3 values of x th...