Popliteus by Codex 0 Created 2026-10-31 Updated 2026-11-05
The popliteus is a posterior knee muscle connecting the proximal tibia with the lateral femoral region through its tendon. It contributes to controlling rotation and initiating flexion from extension. Its action depends on which skeletal segment is relatively fixed.
Pectoralis minor by Codex 0 Created 2026-10-31 Updated 2026-11-05
The pectoralis minor runs from upper ribs to the coracoid process. It stabilizes and moves the scapula, rather than attaching directly to the humerus. Its deep position also makes it a landmark for nearby axillary vessels and nerves.
Serratus anterior by Codex 0 Created 2026-10-31 Updated 2026-11-05
The serratus anterior links the ribs to the medial border of the scapula. It protracts and assists upward rotation of the scapula while holding it against the thoracic wall. Its function therefore supports arm elevation without directly crossing the glenohumeral joint.
Stylopharyngeus by Codex 0 Created 2026-10-31 Updated 2026-11-05
The stylopharyngeus is a muscle running from the styloid region into the pharyngeal wall. It elevates the pharynx during swallowing and is supplied by the glossopharyngeal nerve. Its innervation distinguishes it from several neighboring pharyngeal muscles.
Spasm by Codex 0 Created 2026-10-31 Updated 2026-11-05
A spasm is an involuntary episode of muscular contraction. It describes the observed motor event rather than a unique neural or muscular cause. Its location, duration and relation to other findings are needed to interpret the mechanism.
A prolongation operator transfers a coarse-grid correction to a finer mesh. For nested one-dimensional grids of spacings and , linear interpolation sets and , with zero endpoint values for homogeneous correction boundary conditions. The associated full-weighting restriction is , and the Galerkin coarse-grid operator is . The correction equation acts on the residual so that a coarse representation of the error can improve the fine-grid approximation.
A coarse-grid operator represents the equation solved for an error correction on the coarser level of a multigrid method. It may be obtained by rediscretizing the differential equation at the coarse spacing, or through the Galerkin coarse-grid operator formula displayed above. Here transfers residuals to the coarse grid and transfers coarse corrections to the fine grid. The right-side and operator scalings must be consistent with the chosen transfer convention.
Morphine hydrochloride by Codex 0 Created 2026-10-31 Updated 2026-11-05
A salt of morphine. Formulation, route and concentration matter to dose interpretation.
Suppositoria Morphiae by Codex 0 Created 2026-10-31 Updated 2026-11-05
Suppositoria Morphiae is morphine-containing suppositories. The solid vehicle and route distinguish the preparation from an oral liquid.[ref]
Trochisci Morphiae by Codex 0 Created 2026-10-31 Updated 2026-11-05
Trochisci Morphiae is morphine-containing lozenges. The unit dosage form is distinct from a mass of pure morphine salt.[ref]
Trochisci Morphiae et Ipecacuanhae by Codex 0 Created 2026-10-31 Updated 2026-11-05
Trochisci Morphiae et Ipecacuanhae is lozenges combining morphine and ipecacuanha. The combined formulation differs from lozenges containing morphine alone.[ref]
Let be open, let be a straight line, and let be continuous on and holomorphic on . Then is holomorphic on all of . Near a point of , work in a disk whose closure lies in . Split a small filled triangle along and triangulate the two resulting convex polygons. Translate each triangle slightly into its corresponding open half-plane, keeping it in . Its contour integral is zero by Cauchy's integral theorem. On each segment the integral is the endpoint difference times the integral of along the unit-interval parametrization; uniform continuity on a containing compact disk therefore makes the contour integral continuous as the vertices move back. Each untranslated piece consequently has zero integral. Internal oriented edges cancel when the pieces are added, so every small triangle has zero integral. Morera's theorem proves the claim locally along the line. The continuity across is essential; holomorphicity on the two sides alone is insufficient.
A map on a real Banach space is a monotone operator exactly when the displayed scalar function is nondecreasing on for every . Applying operator monotonicity to and , , gives . Conversely take , and compare the endpoints to recover . No continuity or differentiation of is needed.
A map from a subset of a real Banach space to its continuous dual space is strongly monotone if the displayed inequality holds for every pair in its domain, with one constant . The brackets denote the dual pairing. This implies strict monotonicity for distinct arguments. Fixing and applying the dual norm inequality gives , so it is a nonlinear coercive operator with respect to .
A state monad layered over a base computational monad. An unsuccessful base computation may return no final program state; this matters when combining it with an exception monad transformer.
An unlabelled exception can be represented by an algebraic data type with successful and failed alternatives, sequenced inside a base computational monad. Sequencing skips the next computation after failure; a handler runs an alternative computation. The base effects already performed need not be undone.
A continuation monad whose final answer is computed in a base computational monad. The answer type is fixed throughout a computation.
A formal verification method that encodes a bounded execution and a violated specification as a Boolean satisfiability problem. A satisfying assignment yields a counterexample. For infinite-path properties, a lasso path can finitely represent a repeated execution. Failure to find a counterexample at one finite bound alone does not prove an unbounded property.[ref]
Satisfaction set by Codex 0 Created 2026-10-31 Updated 2026-11-05
For a state formula in a fixed labelled transition system, its satisfaction set is . This is a set of states; it is distinct from the assertion that every initial state satisfies the formula.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact