I'm using maple 11. I found today a wield thing happened when I assigning values to a list.
When Maple was just started, everything is working well. But after several operations, error messages shown bellow appeared. If restart the Maple, everything went well again.
> a:=[1,2];
Error, invalid object: mfenced(mrow(mn("1",mathvariant = "normal"),mo(",",mathvariant = "normal",fence = "false",separator = "true",stretchy = "false",symmetric = "false",largeop = "false",movablelimits = "false",accent = "false",lspace = "0.0em",rspace = "0.3333333em"),mn("2",mathvariant = "normal")),mathvariant = "normal",[7.04, 7.16, 7.28, 7.5, 7.34, 7.33, 7.77, 7.7, 7.62, 7.19, 7.35, 7.16, 7.33, 7.42, 7.4, 7.53, 7.76, 7.82, 7.83, 8.03, 7.86, 7.98, 8.38, 8.25, 8.39, 8.55, 8.86, 8.85, 8.72, 8.83, 8.68, 8.26, 8.1, 8.27, 7.66, 7.1, 7.48, 7.49, 7.41, 7.03, 7.3, 7.24, 7.15, 7.13, 7.5, 7.41, 7.43, 7.4, 7.45, 7.58, 7.8, 7.6, 7.79, 7.43, 7.56, 7.47, 7.56, 7.53, 7.56, 7.7, 7.48, 7.32, 7.3, 7.25, 7.08, 7.3, 7, 6.82, 6.87, 6.37, 5.98, 6.15, 6.41, 7, 6.67, 7.01, 6.7, 6.5, 6.61, 6.4, 6.01, 5.91, 6.1, 6.44, 6.35, 6.05, 6.2, 6.12, 5.89, 5.96, 5.77, 6, 5.75, 5.4, 5.36, 6, 6.06, 6.1, 6.05, 6.1, 6.31, 6.33, 6.17, 6.04, 6.05, 5.98, 6.27, 6.37, 6.33, 6.15, 6.16, 5.85, 5.86, 5.87, 5.75, 5.53, 5.52, 5.67, 5.51, 5.48, 5.44, 5.26, 5.33, 5.17, 4.81, 4.8, 4.64, 4.39, 4.46, 4.17, 4.29, 4, 4, 4, 4.06, 4.23, 4.09, 3.97, 3.97, 3.85, 3.79, 3.93, 3.93, 4.16, 4.18, 4.26, 4.16, 4.1, 4.19, 4.05, 3.96, 3.9, 4.02, 4.11, 4.1, 4.08, 4.1, 4.1, 4.06, 4.06, 4.01, 3.9, 3.88, 3.79, 3.7, 3.67, 3.66, 3.43, 3.18, 3.18, 3.15, 3.19, 3.2, 3, 3.02, 3.19, 3.06, 3.06, 3.01, 2.97, 3, 3.02, 3.07, 3.01, 3.02, 3.03, 3.01, 2.98, 2.9, 2.92, 2.96, 2.89, 2.99, 2.92, 2.78, 2.96, 3.11, 3.01, 2.96, 3.03, 3.15, 3.1, 2.85, 2.85, 2.9, 2.75, 2.7, 2.77, 2.7, 2.61, 2.58, 2.59, 2.64, 2.59, 2.54, 2.51, 2.48, 2.23, 2.32, 2.22, 2.25, 2.2, 2.16, 2.1, 2.13, 2.2, 2.3, 2.56, 2.5, 2.55, 2.75, 2.8, 2.85, 2.52, 2.68, 2.62, 2.75, 2.67, 2.58, 2.88, 2.7, 2.7] = "[",[7.35, 7.27, 7.45, 7.34, 7.42, 7.69, 7.75, 7.65, 7.27, 7.35, 7.18, 7.31, 7.42, 7.44, 7.53, 7.69, 7.81, 7.83, 8.01, 7.86, 8.02, 8.37, 8.23, 8.34, 8.53, 8.84, 8.85, 8.74, 8.83, 8.73, 8.33, 8.1, 8.24, 7.75, 7.01, 7.41, 7.53, 7.48, 7.01, 7.16, 7.24, 7.15, 6.97, 7.55, 7.51, 7.37, 7.45, 7.43, 7.54, 7.74, 7.68, 7.72, 7.44, 7.33, 7.42, 7.54, 7.54, 7.55, 7.69, 7.49, 7.31, 7.35, 7.26, 7.09, 7.15, 7.05, 6.8, 6.86, 6.41, 5.9, 6.16, 6.41, 6.97, 6.77, 7.04, 6.88, 6.58, 6.7, 6.42, 5.93, 5.91, 6.13, 6.45, 6.35, 6.11, 6.18, 6.22, 5.91, 5.96, 5.79, 5.62, 5.38, 5.42, 5.43, 5.58, 6.14, 6.14, 6.05, 6.09, 6.29, 6.34, 6.19, 5.86, 6.1, 6.16, 6.24, 6.31, 6.32, 6.18, 6.16, 5.86, 5.91, 5.91, 5.79, 5.53, 5.57, 5.68, 5.5, 5.49, 5.45, 5.27, 5.3, 5.33, 4.81, 4.86, 4.61, 4.47, 4.46, 4.17, 4.35, 3.94, 4.02, 4.01, 4.05, 4.24, 4.21, 3.97, 3.96, 3.83, 3.84, 3.93, 3.93, 4.16, 4.17, 4.31, 4.2, 4.12, 4.17, 4.11, 3.94, 3.88, 4.02, 4.12, 4.07, 4.06, 4.15, 4.08, 4.11, 4.02, 4.01, 3.9, 3.91, 3.79, 3.68, 3.66, 3.67, 3.44, 3.18, 3.2, 3.17, 3.16, 3.2, 3, 3.02, 3.26, 3.1, 3.04, 3.05, 2.96, 2.99, 3.01, 3.08, 3.01, 3.02, 3.02, 3.06, 2.98, 2.89, 2.93, 2.94, 2.9, 2.99, 2.93, 2.8, 2.71, 2.98, 3.09, 3, 3.02, 3.12, 3.11, 2.94, 2.91, 2.84, 2.81, 2.7, 2.73, 2.69, 2.66, 2.56, 2.58, 2.63, 2.61, 2.56, 2.53, 2.5, 2.26, 2.3, 2.21, 2.25, 2.19, 2.14, 2.09, 2.18, 2.25, 2.26, 2.49, 2.55, 2.55, 2.69, 2.79, 2.87, 2.58, 2.72, 2.68, 2.72, 2.64, 2.62, 2.7, 2.74, 2.69, 2.71] = "]")
aAssignTypesetting:-mambiguous(Typesetting:-merror(?), Typesetting:-merror(
invalid object: mfenced(mrow(mn("1",mathvariant = "normal"),mo(",",mathvari\
ant = "normal",fence = "false",separator = "true",stretchy = "false",symmet\
ric = "false",largeop = "false",movablelimits = "false",accent =
"false",lspace = "0.0em",rspace = "0.3333333em"),mn("2",mathvariant =
"normal")),mathvariant = "normal",[7.04, 7.16, 7.28, 7.5, 7.34, 7.33,
7.77, 7.7, 7.62, 7.19, 7.35, 7.16, 7.33, 7.42, 7.4, 7.53, 7.76, 7.82,
7.83, 8.03, 7.86, 7.98, 8.38, 8.25, 8.39, 8.55, 8.86, 8.85, 8.72, 8.83,
8.68, 8.26, 8.1, 8.27, 7.66, 7.1, 7.48, 7.49, 7.41, 7.03, 7.3, 7.24,
7.15, 7.13, 7.5, 7.41, 7.43, 7.4, 7.45, 7.58, 7.8, 7.6, 7.79, 7.43, 7.56,
7.47, 7.56, 7.53, 7.56, 7.7, 7.48, 7.32, 7.3, 7.25, 7.08, 7.3, 7, 6.82,
6.87, 6.37, 5.98, 6.15, 6.41, 7, 6.67, 7.01, 6.7, 6.5, 6.61, 6.4, 6.01,
5.91, 6.1, 6.44, 6.35, 6.05, 6.2, 6.12, 5.89, 5.96, 5.77, 6, 5.75, 5.4,
5.36, 6, 6.06, 6.1, 6.05, 6.1, 6.31, 6.33, 6.17, 6.04, 6.05, 5.98, 6.27,
6.37, 6.33, 6.15, 6.16, 5.85, 5.86, 5.87, 5.75, 5.53, 5.52, 5.67, 5.51,
5.48, 5.44, 5.26, 5.33, 5.17, 4.81, 4.8, 4.64, 4.39, 4.46, 4.17, 4.29, 4,
4, 4, 4.06, 4.23, 4.09, 3.97, 3.97, 3.85, 3.79, 3.93, 3.93, 4.16, 4.18,
4.26, 4.16, 4.1, 4.19, 4.05, 3.96, 3.9, 4.02, 4.11, 4.1, 4.08, 4.1, 4.1,
4.06, 4.06, 4.01, 3.9, 3.88, 3.79, 3.7, 3.67, 3.66, 3.43, 3.18, 3.18,
3.15, 3.19, 3.2, 3, 3.02, 3.19, 3.06, 3.06, 3.01, 2.97, 3, 3.02, 3.07,
3.01, 3.02, 3.03, 3.01, 2.98, 2.9, 2.92, 2.96, 2.89, 2.99, 2.92, 2.78,
2.96, 3.11, 3.01, 2.96, 3.03, 3.15, 3.1, 2.85, 2.85, 2.9, 2.75, 2.7,
2.77, 2.7, 2.61, 2.58, 2.59, 2.64, 2.59, 2.54, 2.51, 2.48, 2.23, 2.32,
2.22, 2.25, 2.2, 2.16, 2.1, 2.13, 2.2, 2.3, 2.56, 2.5, 2.55, 2.75, 2.8,
2.85, 2.52, 2.68, 2.62, 2.75, 2.67, 2.58, 2.88, 2.7, 2.7] = "[",[7.35,
7.27, 7.45, 7.34, 7.42, 7.69, 7.75, 7.65, 7.27, 7.35, 7.18, 7.31, 7.42,
7.44, 7.53, 7.69, 7.81, 7.83, 8.01, 7.86, 8.02, 8.37, 8.23, 8.34, 8.53,
8.84, 8.85, 8.74, 8.83, 8.73, 8.33, 8.1, 8.24, 7.75, 7.01, 7.41, 7.53,
7.48, 7.01, 7.16, 7.24, 7.15, 6.97, 7.55, 7.51, 7.37, 7.45, 7.43, 7.54,
7.74, 7.68, 7.72, 7.44, 7.33, 7.42, 7.54, 7.54, 7.55, 7.69, 7.49, 7.31,
7.35, 7.26, 7.09, 7.15, 7.05, 6.8, 6.86, 6.41, 5.9, 6.16, 6.41, 6.97,
6.77, 7.04, 6.88, 6.58, 6.7, 6.42, 5.93, 5.91, 6.13, 6.45, 6.35, 6.11,
6.18, 6.22, 5.91, 5.96, 5.79, 5.62, 5.38, 5.42, 5.43, 5.58, 6.14, 6.14,
6.05, 6.09, 6.29, 6.34, 6.19, 5.86, 6.1, 6.16, 6.24, 6.31, 6.32, 6.18,
6.16, 5.86, 5.91, 5.91, 5.79, 5.53, 5.57, 5.68, 5.5, 5.49, 5.45, 5.27,
5.3, 5.33, 4.81, 4.86, 4.61, 4.47, 4.46, 4.17, 4.35, 3.94, 4.02, 4.01,
4.05, 4.24, 4.21, 3.97, 3.96, 3.83, 3.84, 3.93, 3.93, 4.16, 4.17, 4.31,
4.2, 4.12, 4.17, 4.11, 3.94, 3.88, 4.02, 4.12, 4.07, 4.06, 4.15, 4.08,
4.11, 4.02, 4.01, 3.9, 3.91, 3.79, 3.68, 3.66, 3.67, 3.44, 3.18, 3.2,
3.17, 3.16, 3.2, 3, 3.02, 3.26, 3.1, 3.04, 3.05, 2.96, 2.99, 3.01, 3.08,
3.01, 3.02, 3.02, 3.06, 2.98, 2.89, 2.93, 2.94, 2.9, 2.99, 2.93, 2.8,
2.71, 2.98, 3.09, 3, 3.02, 3.12, 3.11, 2.94, 2.91, 2.84, 2.81, 2.7, 2.73,
2.69, 2.66, 2.56, 2.58, 2.63, 2.61, 2.56, 2.53, 2.5, 2.26, 2.3, 2.21,
2.25, 2.19, 2.14, 2.09, 2.18, 2.25, 2.26, 2.49, 2.55, 2.55, 2.69, 2.79,
2.87, 2.58, 2.72, 2.68, 2.72, 2.64, 2.62, 2.7, 2.74, 2.69, 2.71] = "]")))
> a;
[1, 2]
> a[1];
Error, invalid object: mfenced(mrow(mn("1",mathvariant = "normal")),mathvariant = "normal",[7.04, 7.16, 7.28, 7.5, 7.34, 7.33, 7.77, 7.7, 7.62, 7.19, 7.35, 7.16, 7.33, 7.42, 7.4, 7.53, 7.76, 7.82, 7.83, 8.03, 7.86, 7.98, 8.38, 8.25, 8.39, 8.55, 8.86, 8.85, 8.72, 8.83, 8.68, 8.26, 8.1, 8.27, 7.66, 7.1, 7.48, 7.49, 7.41, 7.03, 7.3, 7.24, 7.15, 7.13, 7.5, 7.41, 7.43, 7.4, 7.45, 7.58, 7.8, 7.6, 7.79, 7.43, 7.56, 7.47, 7.56, 7.53, 7.56, 7.7, 7.48, 7.32, 7.3, 7.25, 7.08, 7.3, 7, 6.82, 6.87, 6.37, 5.98, 6.15, 6.41, 7, 6.67, 7.01, 6.7, 6.5, 6.61, 6.4, 6.01, 5.91, 6.1, 6.44, 6.35, 6.05, 6.2, 6.12, 5.89, 5.96, 5.77, 6, 5.75, 5.4, 5.36, 6, 6.06, 6.1, 6.05, 6.1, 6.31, 6.33, 6.17, 6.04, 6.05, 5.98, 6.27, 6.37, 6.33, 6.15, 6.16, 5.85, 5.86, 5.87, 5.75, 5.53, 5.52, 5.67, 5.51, 5.48, 5.44, 5.26, 5.33, 5.17, 4.81, 4.8, 4.64, 4.39, 4.46, 4.17, 4.29, 4, 4, 4, 4.06, 4.23, 4.09, 3.97, 3.97, 3.85, 3.79, 3.93, 3.93, 4.16, 4.18, 4.26, 4.16, 4.1, 4.19, 4.05, 3.96, 3.9, 4.02, 4.11, 4.1, 4.08, 4.1, 4.1, 4.06, 4.06, 4.01, 3.9, 3.88, 3.79, 3.7, 3.67, 3.66, 3.43, 3.18, 3.18, 3.15, 3.19, 3.2, 3, 3.02, 3.19, 3.06, 3.06, 3.01, 2.97, 3, 3.02, 3.07, 3.01, 3.02, 3.03, 3.01, 2.98, 2.9, 2.92, 2.96, 2.89, 2.99, 2.92, 2.78, 2.96, 3.11, 3.01, 2.96, 3.03, 3.15, 3.1, 2.85, 2.85, 2.9, 2.75, 2.7, 2.77, 2.7, 2.61, 2.58, 2.59, 2.64, 2.59, 2.54, 2.51, 2.48, 2.23, 2.32, 2.22, 2.25, 2.2, 2.16, 2.1, 2.13, 2.2, 2.3, 2.56, 2.5, 2.55, 2.75, 2.8, 2.85, 2.52, 2.68, 2.62, 2.75, 2.67, 2.58, 2.88, 2.7, 2.7] = "[",[7.35, 7.27, 7.45, 7.34, 7.42, 7.69, 7.75, 7.65, 7.27, 7.35, 7.18, 7.31, 7.42, 7.44, 7.53, 7.69, 7.81, 7.83, 8.01, 7.86, 8.02, 8.37, 8.23, 8.34, 8.53, 8.84, 8.85, 8.74, 8.83, 8.73, 8.33, 8.1, 8.24, 7.75, 7.01, 7.41, 7.53, 7.48, 7.01, 7.16, 7.24, 7.15, 6.97, 7.55, 7.51, 7.37, 7.45, 7.43, 7.54, 7.74, 7.68, 7.72, 7.44, 7.33, 7.42, 7.54, 7.54, 7.55, 7.69, 7.49, 7.31, 7.35, 7.26, 7.09, 7.15, 7.05, 6.8, 6.86, 6.41, 5.9, 6.16, 6.41, 6.97, 6.77, 7.04, 6.88, 6.58, 6.7, 6.42, 5.93, 5.91, 6.13, 6.45, 6.35, 6.11, 6.18, 6.22, 5.91, 5.96, 5.79, 5.62, 5.38, 5.42, 5.43, 5.58, 6.14, 6.14, 6.05, 6.09, 6.29, 6.34, 6.19, 5.86, 6.1, 6.16, 6.24, 6.31, 6.32, 6.18, 6.16, 5.86, 5.91, 5.91, 5.79, 5.53, 5.57, 5.68, 5.5, 5.49, 5.45, 5.27, 5.3, 5.33, 4.81, 4.86, 4.61, 4.47, 4.46, 4.17, 4.35, 3.94, 4.02, 4.01, 4.05, 4.24, 4.21, 3.97, 3.96, 3.83, 3.84, 3.93, 3.93, 4.16, 4.17, 4.31, 4.2, 4.12, 4.17, 4.11, 3.94, 3.88, 4.02, 4.12, 4.07, 4.06, 4.15, 4.08, 4.11, 4.02, 4.01, 3.9, 3.91, 3.79, 3.68, 3.66, 3.67, 3.44, 3.18, 3.2, 3.17, 3.16, 3.2, 3, 3.02, 3.26, 3.1, 3.04, 3.05, 2.96, 2.99, 3.01, 3.08, 3.01, 3.02, 3.02, 3.06, 2.98, 2.89, 2.93, 2.94, 2.9, 2.99, 2.93, 2.8, 2.71, 2.98, 3.09, 3, 3.02, 3.12, 3.11, 2.94, 2.91, 2.84, 2.81, 2.7, 2.73, 2.69, 2.66, 2.56, 2.58, 2.63, 2.61, 2.56, 2.53, 2.5, 2.26, 2.3, 2.21, 2.25, 2.19, 2.14, 2.09, 2.18, 2.25, 2.26, 2.49, 2.55, 2.55, 2.69, 2.79, 2.87, 2.58, 2.72, 2.68, 2.72, 2.64, 2.62, 2.7, 2.74, 2.69, 2.71] = "]")
aTypesetting:-mambiguous(Typesetting:-merror(?), Typesetting:-merror(invalid
object: mfenced(mrow(mn("1",mathvariant = "normal")),mathvariant =
"normal",[7.04, 7.16, 7.28, 7.5, 7.34, 7.33, 7.77, 7.7, 7.62, 7.19, 7.35,
7.16, 7.33, 7.42, 7.4, 7.53, 7.76, 7.82, 7.83, 8.03, 7.86, 7.98, 8.38,
8.25, 8.39, 8.55, 8.86, 8.85, 8.72, 8.83, 8.68, 8.26, 8.1, 8.27, 7.66,
7.1, 7.48, 7.49, 7.41, 7.03, 7.3, 7.24, 7.15, 7.13, 7.5, 7.41, 7.43, 7.4,
7.45, 7.58, 7.8, 7.6, 7.79, 7.43, 7.56, 7.47, 7.56, 7.53, 7.56, 7.7,
7.48, 7.32, 7.3, 7.25, 7.08, 7.3, 7, 6.82, 6.87, 6.37, 5.98, 6.15, 6.41,
7, 6.67, 7.01, 6.7, 6.5, 6.61, 6.4, 6.01, 5.91, 6.1, 6.44, 6.35, 6.05,
6.2, 6.12, 5.89, 5.96, 5.77, 6, 5.75, 5.4, 5.36, 6, 6.06, 6.1, 6.05, 6.1,
6.31, 6.33, 6.17, 6.04, 6.05, 5.98, 6.27, 6.37, 6.33, 6.15, 6.16, 5.85,
5.86, 5.87, 5.75, 5.53, 5.52, 5.67, 5.51, 5.48, 5.44, 5.26, 5.33, 5.17,
4.81, 4.8, 4.64, 4.39, 4.46, 4.17, 4.29, 4, 4, 4, 4.06, 4.23, 4.09, 3.97,
3.97, 3.85, 3.79, 3.93, 3.93, 4.16, 4.18, 4.26, 4.16, 4.1, 4.19, 4.05,
3.96, 3.9, 4.02, 4.11, 4.1, 4.08, 4.1, 4.1, 4.06, 4.06, 4.01, 3.9, 3.88,
3.79, 3.7, 3.67, 3.66, 3.43, 3.18, 3.18, 3.15, 3.19, 3.2, 3, 3.02, 3.19,
3.06, 3.06, 3.01, 2.97, 3, 3.02, 3.07, 3.01, 3.02, 3.03, 3.01, 2.98, 2.9,
2.92, 2.96, 2.89, 2.99, 2.92, 2.78, 2.96, 3.11, 3.01, 2.96, 3.03, 3.15,
3.1, 2.85, 2.85, 2.9, 2.75, 2.7, 2.77, 2.7, 2.61, 2.58, 2.59, 2.64, 2.59,
2.54, 2.51, 2.48, 2.23, 2.32, 2.22, 2.25, 2.2, 2.16, 2.1, 2.13, 2.2, 2.3,
2.56, 2.5, 2.55, 2.75, 2.8, 2.85, 2.52, 2.68, 2.62, 2.75, 2.67, 2.58,
2.88, 2.7, 2.7] = "[",[7.35, 7.27, 7.45, 7.34, 7.42, 7.69, 7.75, 7.65,
7.27, 7.35, 7.18, 7.31, 7.42, 7.44, 7.53, 7.69, 7.81, 7.83, 8.01, 7.86,
8.02, 8.37, 8.23, 8.34, 8.53, 8.84, 8.85, 8.74, 8.83, 8.73, 8.33, 8.1,
8.24, 7.75, 7.01, 7.41, 7.53, 7.48, 7.01, 7.16, 7.24, 7.15, 6.97, 7.55,
7.51, 7.37, 7.45, 7.43, 7.54, 7.74, 7.68, 7.72, 7.44, 7.33, 7.42, 7.54,
7.54, 7.55, 7.69, 7.49, 7.31, 7.35, 7.26, 7.09, 7.15, 7.05, 6.8, 6.86,
6.41, 5.9, 6.16, 6.41, 6.97, 6.77, 7.04, 6.88, 6.58, 6.7, 6.42, 5.93,
5.91, 6.13, 6.45, 6.35, 6.11, 6.18, 6.22, 5.91, 5.96, 5.79, 5.62, 5.38,
5.42, 5.43, 5.58, 6.14, 6.14, 6.05, 6.09, 6.29, 6.34, 6.19, 5.86, 6.1,
6.16, 6.24, 6.31, 6.32, 6.18, 6.16, 5.86, 5.91, 5.91, 5.79, 5.53, 5.57,
5.68, 5.5, 5.49, 5.45, 5.27, 5.3, 5.33, 4.81, 4.86, 4.61, 4.47, 4.46,
4.17, 4.35, 3.94, 4.02, 4.01, 4.05, 4.24, 4.21, 3.97, 3.96, 3.83, 3.84,
3.93, 3.93, 4.16, 4.17, 4.31, 4.2, 4.12, 4.17, 4.11, 3.94, 3.88, 4.02,
4.12, 4.07, 4.06, 4.15, 4.08, 4.11, 4.02, 4.01, 3.9, 3.91, 3.79, 3.68,
3.66, 3.67, 3.44, 3.18, 3.2, 3.17, 3.16, 3.2, 3, 3.02, 3.26, 3.1, 3.04,
3.05, 2.96, 2.99, 3.01, 3.08, 3.01, 3.02, 3.02, 3.06, 2.98, 2.89, 2.93,
2.94, 2.9, 2.99, 2.93, 2.8, 2.71, 2.98, 3.09, 3, 3.02, 3.12, 3.11, 2.94,
2.91, 2.84, 2.81, 2.7, 2.73, 2.69, 2.66, 2.56, 2.58, 2.63, 2.61, 2.56,
2.53, 2.5, 2.26, 2.3, 2.21, 2.25, 2.19, 2.14, 2.09, 2.18, 2.25, 2.26,
2.49, 2.55, 2.55, 2.69, 2.79, 2.87, 2.58, 2.72, 2.68, 2.72, 2.64, 2.62,
2.7, 2.74, 2.69, 2.71] = "]")))
