Aug 29, 2025 · In Dirac's Principles of Quantum Mechanics published in 1930 he introduced a "convenient notation" he referred to as a "delta function" which he treated as a continuum analog to …

May 12, 2009 · The discussion focuses on determining the linear independence of four vectors represented as 1x4 matrices: v1 = [1,4,2,8]^t, v2 = [2,5,3,9]^t, v3 = [11,14,12,18]^t, and v4 = …

Jan 4, 2026 · It's been another incredible year spent on PF! Thanks to all contributing members for making it special! This year we're coming upon 25 years of PF. Congrats to all who were nominated …

Dec 28, 2025 · The discussion centers on Voxon's volumetric holographic display technology, which is currently in the proof of concept phase. Participants express interest in creating 3D holograms for 3D …

May 30, 2012 · The discussion centers on the load rating of 6061-T6 aluminum rectangular tubing, specifically dimensions 4x2x0.125 inches, for supporting a compromised pickup camper cabover …

Sep 6, 2011 · 4 60" pieces of 1x4 4 12" pieces of 4x4 3 primer spray cans and 3 black spray cans 2 joist hangers 50 #12 3" screws 25 #6 1.5" screws I painted everything first with rattle cans, primer and …

Aug 23, 2011 · The chemical formula for diesel fuel is often represented as C12H23, although this is an empirical formula rather than a structural formula. Diesel is composed of a complex mixture of …

Aug 8, 2016 · This discussion focuses on the use of F6 tallies in MCNP simulations, specifically regarding the normalization of energy density values. The F6 tally normalizes to the total source …

Jun 9, 2012 · The discussion focuses on calculating the uncertainty of the average of three measurements: 3.30±0.1, 3.32±0.1, and 3.31±0.1. It establishes that the errors in these …

Jan 27, 2009 · The discussion centers on the design of a small projectile launcher, specifically comparing trebuchets and spring-powered cannons for launching a 50-100g mass accurately over a …