Add big_sepL2_nil_inv_l/r.

See merge request iris/iris!442

Explain our language axioms better

Closes #271

See merge request iris/iris!440

use new select tactic from std++

See merge request iris/iris!438

Make core_id_local_update work with fractional authority

See merge request iris/iris!430

CHANGELOG.md: Fix typo

See merge request iris/iris!437

Add mapsto_ne helper lemma

See merge request iris/iris!417

Here's one case this lemma might be useful. Suppose we want to
programmatically generate namespaces for e.g. locks:

```
Definition lockN (l : loc) := nroot .@ "lock" .@ l.
```

Then to know that two such namespaces are disjoint, we need to know
that the corresponding locations are distinct. For that we use
the lemma here introduced.

```
Lemma ne l1 l2 v1 v2 :
  l1 ↦ v1 -∗ l2 ↦ v2 -∗ ⌜l1 ≠ l2⌝.
Proof. iApply mapsto_mapsto_ne. (* goal ¬ ✓ 2%Qp *) by intros []. Qed.
```

Improve `coreP` construction.

See merge request !436

Rename auth_both_frac_op into auth_both_op

See merge request !434

Simon Friis Vindum authored 4 years ago and Ralf Jung committed 4 years ago

Removes auth_both_op and renames auth_both_frac_op into auth_both_op.

Fix some typos in docs

See merge request iris/iris!433

Add heap_lang lib for "invariant locations": locations with a (pure) invariant attached to them

See merge request iris/iris!289

Make use of `▷^` notation in its definition.

See merge request iris/iris!428