NUM_ADD_CONV : term -> thm

SYNOPSIS
Proves what the sum of two natural number numerals is.

DESCRIPTION
If n and m are numerals (e.g. 0, 1, 2, 3,...), then NUM_ADD_CONV `n + m` returns the theorem:
   |- n + m = s
where s is the numeral that denotes the sum of the natural numbers denoted by n and m.

FAILURE CONDITIONS
NUM_ADD_CONV tm fails if tm is not of the form `n + m`, where n and m are numerals.

EXAMPLE
  # NUM_ADD_CONV `75 + 25`;;
  val it : thm = |- 75 + 25 = 100

SEE ALSO
NUM_DIV_CONV, NUM_EQ_CONV, NUM_EVEN_CONV, NUM_EXP_CONV, NUM_FACT_CONV, NUM_GE_CONV, NUM_GT_CONV, NUM_LE_CONV, NUM_LT_CONV, NUM_MAX_CONV, NUM_MIN_CONV, NUM_MOD_CONV, NUM_MULT_CONV, NUM_ODD_CONV, NUM_PRE_CONV, NUM_REDUCE_CONV, NUM_RED_CONV, NUM_REL_CONV, NUM_SUB_CONV, NUM_SUC_CONV.