From b92fff2e1afc00f1a9550332e7b19e613417eaf9 Mon Sep 17 00:00:00 2001
From: T0mstone <realt0mstone@gmail.com>
Date: Mon, 8 Sep 2025 23:21:47 +0200
Subject: [PATCH] Allow returning zero from Lt callable constructor

---
 galgebra/lt.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/galgebra/lt.py b/galgebra/lt.py
index 857bf9fc..4529659b 100644
--- a/galgebra/lt.py
+++ b/galgebra/lt.py
@@ -362,7 +362,7 @@ def __init__(self, *args, ga, f=False, mode='g'):
             self.lt_dict = {}
             for base in self.Ga.basis:
                 out = F(mv.Mv(base, ga=self.Ga))
-                if not out.is_vector():
+                if not out.is_vector() and not out.is_zero():
                     raise ValueError('{} must return vectors'.format(F))
                 self.lt_dict[base] = out.obj
         else: