Issues

• A curve stated as lines over links with different dimensions loads, and then its expansion is refused

  bug
  energy-models/mathspec#891 · Filter by author FBumann opened on Oct 16, 2026

• The canonical form keeps cases and relation columns in file order, so two files that state one spec differ in it

  bug
  energy-models/mathspec#890 · Filter by author FBumann opened on Oct 16, 2026

• assumptions can be used to enforce absence

  energy-models/mathspec#876 · Filter by author brynpickering opened on Oct 12, 2026

• assumptions can check for completeness of expressions / constraints

  energy-models/mathspec#866 · Filter by author brynpickering opened on Oct 10, 2026

• Decide before 1.0.0 whether the language keeps macros

  v1.0.0
  energy-models/mathspec#865 · Filter by author FBumann opened on Oct 9, 2026

• A parameter value that is infinite is refused when the data is attached, now that missing: says what a missing row means

  v0.4.0
  energy-models/mathspec#863 · Filter by author FBumann opened on Oct 8, 2026
  1

• A fragment cannot divide by an expression it reads under given:, even one a sibling defines from parameters only

  design: open
  energy-models/mathspec#862 · Filter by author willu47 opened on Oct 8, 2026
  2

• fix(language): a neutral parameter as a divisor, a bound or a constant side is refused at load

  bug
  energy-models/mathspec#861 · Filter by author FabianHofmann opened on Oct 7, 2026

• ordered: false over an ordered dimension loads in a merge and is refused in a patch

  bug
  energy-models/mathspec#860 · Filter by author FabianHofmann opened on Oct 7, 2026

• The example specs are not in the canonical form, and no gate checks it

  energy-models/mathspec#859 · Filter by author FabianHofmann opened on Oct 7, 2026

• Design: squeeze, specializing a spec by removing a dimension

  design: open
  energy-models/mathspec#854 · Filter by author FBumann opened on Oct 6, 2026
  3

• pypsa_split writes ordered only in fragments that step along the dimension

  energy-models/mathspec#846 · Filter by author FabianHofmann opened on Oct 6, 2026

• Extra features for typesetting when using markdown and building with MKDocs / Zensical

  area: typesettingdocs
  energy-models/mathspec#845 · Filter by author brynpickering opened on Oct 6, 2026

• one YAML per component declares both the stored data and the math, and datarecord derives its schema from it

  area: data contractdesign: open
  energy-models/mathspec#843 · Filter by author FabianHofmann opened on Oct 6, 2026
  1

• A program exports to JSON, so an engine in another language reads it without a second lowering

  area: data contractdesign: open
  energy-models/mathspec#841 · Filter by author FabianHofmann opened on Oct 6, 2026

• a patched spec compiles to TeX

  energy-models/mathspec#839 · Filter by author FabianHofmann opened on Oct 4, 2026

• A parameter, variable or expression may declare its unit as a label that nothing checks

  energy-models/mathspec#836 · Filter by author FBumann opened on Oct 2, 2026
  2

• MGA: state optimize_mga and optimize_mga_in_direction as a patch file over pypsa.yaml

  docs
  energy-models/mathspec#833 · Filter by author FabianHofmann opened on Oct 2, 2026

• no PyPSA rung has a link, process, line or transformer that does not stand, so 164 masks of the PyPSA files go untested

  energy-models/mathspec#830 · Filter by author FBumann opened on Oct 2, 2026

• a rung's own PyPSA fragments still need integers, squares and a quadratic constraint, and do not merge into a whole model

  area: compositiondesign: open
  energy-models/mathspec#829 · Filter by author FBumann opened on Oct 1, 2026
  2

• a continuous variable that is integral by construction cannot be a binary factor, so binary_products costs integer columns the solver does not need

  area: formulations
  energy-models/mathspec#828 · Filter by author FBumann opened on Oct 1, 2026

• Examples of other math specifications

  docs
  energy-models/mathspec#791 · Filter by author brynpickering opened on Sep 29, 2026
  1

• PyPSA parity with master: open points, new master changes and the PyPSA bugs found

  meta
  energy-models/mathspec#783 · Filter by author FabianHofmann opened on Sep 29, 2026
  2

• Calliope v0.7.0's math ports to mathspec, and nine gaps cost the port a workaround

  meta
  energy-models/mathspec#777 · Filter by author FBumann opened on Sep 29, 2026

• a parameter has one shape, while Calliope lets the data decide whether a limit is per technology, per node or per group

  area: data contractdesign: scope
  energy-models/mathspec#775 · Filter by author FBumann opened on Sep 29, 2026
  2