This file records noteworthy changes.
+1.7.3 (1 February 2018)
+* Speed up some corner cases of polynomial factorization.
+* Speed up some corner cases of gcd computation.
+* Speed up factorization of pre-factored polynomials.
+* Make matrix::solve() work with hidden (non-normal) zeros.
+* Fix bug in evaluation of real and imaginary parts of powers.
+* Fix some LaTeX output, add new function symbol::get_TeX_name().
+
+1.7.2 (10 January 2017)
+* Fix memory leak in operators returning relationals, introduced in 1.7.0.
+* Make macro GINAC_DECLARE_REGISTERED_CLASS() work outside namespace GiNaC.
+* Fix some build issues.
+
1.7.1 (2 October 2016)
* Fix crash in basic::subs(), visible in classes which don't override it.
* Fix convergence failure in Li_projection.