sentence1: Why cant I redefine the variable defined in a -LSB- math -RSB- \ texttt -LCB- if -RCB- -LSB- / math -RSB- or -LSB- math -RSB- \ texttt -LCB- if -RCB- -LSB- / math -RSB- -- -LSB- math -RSB- \ texttt -LCB- else -RCB- -LSB- / math -RSB- statement after the statement ended ?
sentence2: Would you write a math extended essay about the thermodynamics of a Cepheid or math behind Rubik 's cube ? Why ?