Alex Ghitza's Status Report for Sage Days 12

I fixed the following bugs:

Modular Symbols (with Craig Citro)

• #1127 - modularSymbol complement fails for E=128a
• #2535 - Problem with cuspidal_subspace and new_subspace for modular symbols

NOTE: We used a naive approach to solving both of these issues, but there is more to be done about complement() and dual_free_module() for submodules of modular symbols, see for instance the new #5080 that was uncovered by Robert Bradshaw and Craig Citro.

Packages

• #4322 - modular polynomials database is broken

• #4755 - CremonaDatabase().number_of_curves() should work when the optional database isn't installed

Number Theory

• #3045 - K.gen() where K = GF(p) returns 1, not a primitive element

Linear Algebra

• #4048 - missing minpoly for GF(p)

Calculus

• #2404 - subs_expr claims to take a dictionary, but doesn't

Documentation

• #5077 - bug in fibonacci function
• #5087 - purge "cannonical" typos