New posts in upper-lower-bounds

Simplest way to get the lower bound $\pi > 3.14$

real-analysis sequences-and-series inequality pi upper-lower-bounds

Are there "tight" (as possible) upper bounds for $\max_t{\left\{ \left|\frac{d f(t)}{dt}\right|\right\}}$ for time-limited functions???

real-analysis derivatives convergence-divergence fourier-analysis upper-lower-bounds